diff --git a/Source/Core/Editing/ClassicMode.cs b/Source/Core/Editing/ClassicMode.cs
index 73ef18cf..229b662a 100644
--- a/Source/Core/Editing/ClassicMode.cs
+++ b/Source/Core/Editing/ClassicMode.cs
@@ -68,7 +68,7 @@ namespace CodeImp.DoomBuilder.Editing
 		// Selection
 		protected bool selecting;
 		protected bool selectpressed; //mxd
-		private Vector2D selectstart;
+		protected Vector2D selectstart;
 		protected RectangleF selectionrect;
 		protected MarqueSelectionMode marqueSelectionMode; //mxd
 
@@ -588,6 +588,31 @@ namespace CodeImp.DoomBuilder.Editing
 			base.OnMouseUp(e);
 		}
 
+		//mxd
+		public override void OnKeyDown(KeyEventArgs e)
+		{
+			// Update marque color when modifier keys are pressed
+			if(selecting && (e.Control || e.Shift))
+			{
+				OnUpdateMultiSelection();
+				General.Interface.RedrawDisplay();
+			} 
+
+			base.OnKeyDown(e);
+		}
+
+		//mxd
+		public override void OnKeyUp(KeyEventArgs e)
+		{
+			// Update marque color when modifier keys are released
+			if(selecting && (!e.Control || !e.Shift))
+			{
+				OnUpdateMultiSelection();
+				General.Interface.RedrawDisplay();
+			}
+			base.OnKeyUp(e);
+		}
+
 		/// <summary>
 		/// Automatically called when dragging operation starts.
 		/// </summary>
diff --git a/Source/Plugins/BuilderModes/ClassicModes/LinedefsMode.cs b/Source/Plugins/BuilderModes/ClassicModes/LinedefsMode.cs
index 1900013d..4176e8de 100644
--- a/Source/Plugins/BuilderModes/ClassicModes/LinedefsMode.cs
+++ b/Source/Plugins/BuilderModes/ClassicModes/LinedefsMode.cs
@@ -349,6 +349,52 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			return selectionrect.Contains(l.Start.Position.x, l.Start.Position.y) && selectionrect.Contains(l.End.Position.x, l.End.Position.y);
 		}
 
+		//mxd. Gets map elements inside of selectionoutline and sorts them by distance to targetpoint
+		private List<Linedef> GetOrderedSelection(Vector2D targetpoint, List<Line2D> selectionoutline)
+		{
+			// Gather affected sectors
+			List<Linedef> result = new List<Linedef>();
+			foreach(Linedef l in General.Map.Map.Linedefs)
+			{
+				if(IsInSelectionRect(l, selectionoutline)) result.Add(l);
+			}
+
+			if(result.Count == 0) return result;
+
+			// Sort by distance to targetpoint
+			result.Sort(delegate(Linedef l1, Linedef l2)
+			{
+				if(l1 == l2) return 0;
+
+				// Get closest distance from l1 to selectstart
+				float closest1 = float.MaxValue;
+				
+				Vector2D pos = l1.Start.Position;
+				float curdistance = Vector2D.DistanceSq(pos, targetpoint);
+				if(curdistance < closest1) closest1 = curdistance;
+
+				pos = l1.End.Position;
+				curdistance = Vector2D.DistanceSq(pos, targetpoint);
+				if(curdistance < closest1) closest1 = curdistance;
+
+				// Get closest distance from l2 to selectstart
+				float closest2 = float.MaxValue;
+
+				pos = l2.Start.Position;
+				curdistance = Vector2D.DistanceSq(pos, targetpoint);
+				if(curdistance < closest2) closest2 = curdistance;
+
+				pos = l2.End.Position;
+				curdistance = Vector2D.DistanceSq(pos, targetpoint);
+				if(curdistance < closest2) closest2 = curdistance;
+
+				// Return closer one
+				return (int)(closest1 - closest2);
+			});
+
+			return result;
+		}
+
 		//mxd. This sets up new labels
 		private void SetupSectorLabels()
 		{
@@ -992,7 +1038,7 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			   
 			if(selectionvolume)
 			{
-				List<Line2D> selectionOutline = new List<Line2D> 
+				List<Line2D> selectionoutline = new List<Line2D> 
 				{
 					new Line2D(selectionrect.Left, selectionrect.Top, selectionrect.Right, selectionrect.Top),
 					new Line2D(selectionrect.Right, selectionrect.Top, selectionrect.Right, selectionrect.Bottom),
@@ -1005,8 +1051,15 @@ namespace CodeImp.DoomBuilder.BuilderModes
 				switch(marqueSelectionMode) 
 				{
 					case MarqueSelectionMode.SELECT:
-						foreach(Linedef l in General.Map.Map.Linedefs)
-							l.Selected = IsInSelectionRect(l, selectionOutline);
+						// Get ordered selection
+						List<Linedef> selectresult = GetOrderedSelection(base.selectstart, selectionoutline);
+
+						// First deselect everything...
+						foreach(Linedef l in General.Map.Map.Linedefs) l.Selected = false;
+
+						// Then select lines in correct order
+						foreach(Linedef l in selectresult) l.Selected = true;
+
 						if(selectthings)
 						{
 							foreach(Thing t in General.Map.ThingsFilter.VisibleThings)
@@ -1015,8 +1068,15 @@ namespace CodeImp.DoomBuilder.BuilderModes
 						break;
 
 					case MarqueSelectionMode.ADD:
-						foreach(Linedef l in General.Map.Map.Linedefs)
-							l.Selected |= IsInSelectionRect(l, selectionOutline);
+						// Get ordered selection
+						List<Linedef> addresult = GetOrderedSelection(selectstart, selectionoutline);
+
+						// First deselect everything inside of selection...
+						foreach(Linedef l in addresult) l.Selected = false;
+
+						// Then reselect in correct order
+						foreach(Linedef l in addresult) l.Selected = true;
+
 						if(selectthings)
 						{
 							foreach(Thing t in General.Map.ThingsFilter.VisibleThings)
@@ -1025,8 +1085,9 @@ namespace CodeImp.DoomBuilder.BuilderModes
 						break;
 
 					case MarqueSelectionMode.SUBTRACT:
+						// Selection order doesn't matter here
 						foreach(Linedef l in General.Map.Map.Linedefs)
-							if(IsInSelectionRect(l, selectionOutline)) l.Selected = false;
+							if(IsInSelectionRect(l, selectionoutline)) l.Selected = false;
 						if(selectthings)
 						{
 							foreach(Thing t in General.Map.ThingsFilter.VisibleThings)
@@ -1034,9 +1095,11 @@ namespace CodeImp.DoomBuilder.BuilderModes
 						}
 						break;
 
+					// Should be Intersect selection mode
 					default:
+						// Selection order doesn't matter here
 						foreach(Linedef l in General.Map.Map.Linedefs)
-							if(!IsInSelectionRect(l, selectionOutline)) l.Selected = false;
+							if(!IsInSelectionRect(l, selectionoutline)) l.Selected = false;
 						if(selectthings)
 						{
 							foreach(Thing t in General.Map.ThingsFilter.VisibleThings)
diff --git a/Source/Plugins/BuilderModes/ClassicModes/SectorsMode.cs b/Source/Plugins/BuilderModes/ClassicModes/SectorsMode.cs
index 3bddebb0..32e698fa 100644
--- a/Source/Plugins/BuilderModes/ClassicModes/SectorsMode.cs
+++ b/Source/Plugins/BuilderModes/ClassicModes/SectorsMode.cs
@@ -606,6 +606,48 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			return false;
 		}
 
+		//mxd. Gets map elements inside of selectionoutline and sorts them by distance to targetpoint
+		private List<Sector> GetOrderedSelection(Vector2D targetpoint, List<Line2D> selectionoutline)
+		{
+			// Gather affected sectors
+			List<Sector> result = new List<Sector>();
+			foreach(Sector s in General.Map.Map.Sectors)
+			{
+				if(IsInSelectionRect(s, selectionoutline)) result.Add(s);
+			}
+
+			if(result.Count == 0) return result;
+
+			// Sort by distance to targetpoint
+			result.Sort(delegate(Sector s1, Sector s2)
+			{
+				if(s1 == s2) return 0;
+
+				// Get closest distance from s1 to selectstart
+				float closest1 = float.MaxValue;
+				foreach(Sidedef side in s1.Sidedefs)
+				{
+					Vector2D pos = (side.IsFront ? side.Line.Start : side.Line.End).Position;
+					float curdistance = Vector2D.DistanceSq(pos, targetpoint);
+					if(curdistance < closest1) closest1 = curdistance;
+				}
+
+				// Get closest distance from s2 to selectstart
+				float closest2 = float.MaxValue;
+				foreach(Sidedef side in s2.Sidedefs)
+				{
+					Vector2D pos = (side.IsFront ? side.Line.Start : side.Line.End).Position;
+					float curdistance = Vector2D.DistanceSq(pos, targetpoint);
+					if(curdistance < closest2) closest2 = curdistance;
+				}
+
+				// Return closer one
+				return (int)(closest1 - closest2);
+			});
+
+			return result;
+		}
+
 		//mxd
 		public override void SelectMapElement(SelectableElement element)
 		{
@@ -1195,54 +1237,63 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			return true;
 		}
 
-		// This is called wheh selection ends
+		//mxd. This is called wheh selection ends
 		protected override void OnEndMultiSelection()
 		{
 			bool selectionvolume = ((Math.Abs(base.selectionrect.Width) > 0.1f) && (Math.Abs(base.selectionrect.Height) > 0.1f));
 
 			if(selectionvolume)
 			{
-				List<Line2D> selectionOutline = new List<Line2D> {
+				List<Line2D> selectionoutline = new List<Line2D>
+				{
 					new Line2D(selectionrect.Left, selectionrect.Top, selectionrect.Right, selectionrect.Top),
 					new Line2D(selectionrect.Right, selectionrect.Top, selectionrect.Right, selectionrect.Bottom),
 					new Line2D(selectionrect.Left, selectionrect.Bottom, selectionrect.Right, selectionrect.Bottom),
 					new Line2D(selectionrect.Left, selectionrect.Bottom, selectionrect.Left, selectionrect.Top)
 				};
 				
-				//mxd. (de)select sectors
+				// (De)select sectors
 				switch(marqueSelectionMode) 
 				{
 					case MarqueSelectionMode.SELECT:
-						foreach(Sector s in General.Map.Map.Sectors)
-						{
-							bool select = IsInSelectionRect(s, selectionOutline);
-							if(select && !s.Selected) SelectSector(s, true, false);
-							else if(!select && s.Selected) SelectSector(s, false, false);
-						}
+						// Get ordered selection
+						List<Sector> selectresult = GetOrderedSelection(base.selectstart, selectionoutline);
+
+						// First deselect everything...
+						foreach(Sector s in General.Map.Map.Sectors) SelectSector(s, false, false);
+						
+						// Then select sectors in correct order
+						foreach(Sector s in selectresult) SelectSector(s, true, false);
 						break;
 
 					case MarqueSelectionMode.ADD:
-						foreach(Sector s in General.Map.Map.Sectors) 
-						{
-							if(!s.Selected && IsInSelectionRect(s, selectionOutline))
-								SelectSector(s, true, false);
-						}
+						// Get ordered selection
+						List<Sector> addresult = GetOrderedSelection(selectstart, selectionoutline);
+
+						// First deselect everything inside of selection...
+						foreach(Sector s in addresult) SelectSector(s, false, false);
+
+						// Then reselect in correct order
+						foreach(Sector s in addresult) SelectSector(s, true, false);
 						break;
 
 					case MarqueSelectionMode.SUBTRACT:
+						// Selection order doesn't matter here
 						foreach(Sector s in General.Map.Map.Sectors) 
 						{
 							if(!s.Selected) continue;
-							if(IsInSelectionRect(s, selectionOutline))
+							if(IsInSelectionRect(s, selectionoutline))
 								SelectSector(s, false, false);
 						}
 						break;
 
-					default: //should be Intersect
+					// Should be Intersect selection mode
+					default: 
+						// Selection order doesn't matter here
 						foreach(Sector s in General.Map.Map.Sectors) 
 						{
 							if(!s.Selected) continue;
-							if(!IsInSelectionRect(s, selectionOutline))
+							if(!IsInSelectionRect(s, selectionoutline))
 								SelectSector(s, false, false);
 						}
 						break;
diff --git a/Source/Plugins/BuilderModes/ClassicModes/ThingsMode.cs b/Source/Plugins/BuilderModes/ClassicModes/ThingsMode.cs
index e4288c10..6a51d176 100644
--- a/Source/Plugins/BuilderModes/ClassicModes/ThingsMode.cs
+++ b/Source/Plugins/BuilderModes/ClassicModes/ThingsMode.cs
@@ -804,21 +804,36 @@ namespace CodeImp.DoomBuilder.BuilderModes
 				switch(marqueSelectionMode) 
 				{
 					case MarqueSelectionMode.SELECT:
-						foreach(Thing t in General.Map.ThingsFilter.VisibleThings)
-							t.Selected = selectionrect.Contains(t.Position.x, t.Position.y);
+						// Get ordered selection
+						List<Thing> selectresult = GetOrderedSelection(base.selectstart, selectionrect);
+
+						// First deselect everything...
+						foreach(Thing t in General.Map.Map.Things) t.Selected = false;
+
+						// Then select things in correct order
+						foreach(Thing t in selectresult) t.Selected = true;
 						break;
 
 					case MarqueSelectionMode.ADD:
-						foreach(Thing t in General.Map.ThingsFilter.VisibleThings)
-							t.Selected |= selectionrect.Contains(t.Position.x, t.Position.y);
+						// Get ordered selection
+						List<Thing> addresult = GetOrderedSelection(selectstart, selectionrect);
+
+						// First deselect everything inside of selection...
+						foreach(Thing t in addresult) t.Selected = false;
+
+						// Then reselect in correct order
+						foreach(Thing t in addresult) t.Selected = true;
 						break;
 
 					case MarqueSelectionMode.SUBTRACT:
+						// Selection order doesn't matter here
 						foreach(Thing t in General.Map.ThingsFilter.VisibleThings)
 							if(selectionrect.Contains(t.Position.x, t.Position.y)) t.Selected = false;
 						break;
 
-					default: //should be Intersect
+					// Should be Intersect selection mode
+					default:
+						// Selection order doesn't matter here
 						foreach(Thing t in General.Map.ThingsFilter.VisibleThings)
 							if(!selectionrect.Contains(t.Position.x, t.Position.y)) t.Selected = false;
 						break;
@@ -891,6 +906,34 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			}
 		}
 
+		//mxd. Gets map elements inside of selectionoutline and sorts them by distance to targetpoint
+		private List<Thing> GetOrderedSelection(Vector2D targetpoint, RectangleF selection)
+		{
+			// Gather affected sectors
+			List<Thing> result = new List<Thing>();
+			foreach(Thing t in General.Map.ThingsFilter.VisibleThings)
+			{
+				if(selection.Contains(t.Position.x, t.Position.y)) result.Add(t);
+			}
+
+			if(result.Count == 0) return result;
+
+			// Sort by distance to targetpoint
+			result.Sort(delegate(Thing t1, Thing t2)
+			{
+				if(t1 == t2) return 0;
+
+				// Get closest distance from thing to selectstart
+				float closest1 = Vector2D.DistanceSq(t1.Position, targetpoint);
+				float closest2 = Vector2D.DistanceSq(t2.Position, targetpoint);
+
+				// Return closer one
+				return (int)(closest1 - closest2);
+			});
+
+			return result;
+		}
+
 		//mxd. This sets up new labels
 		private void SetupSectorLabels()
 		{