diff --git a/src/maploader/specials.cpp b/src/maploader/specials.cpp
index 6304c41d9..2799daded 100644
--- a/src/maploader/specials.cpp
+++ b/src/maploader/specials.cpp
@@ -1372,11 +1372,33 @@ void MapLoader::SpawnScrollers()
 		}
 
 		case Scroll_Texture_Offsets:
+		{
 			// killough 3/2/98: scroll according to sidedef offsets
-			side = Level->lines[i].sidedef[0];
-			Level->CreateThinker<DScroller>(EScroll::sc_side, -side->GetTextureXOffset(side_t::mid),
-				side->GetTextureYOffset(side_t::mid), nullptr, nullptr, side, accel, SCROLLTYPE(l->args[0]));
+			side = l->sidedef[0];
+			if (l->args[2] & 3)
+			{
+				// if 1, then displacement
+				// if 2, then accelerative (also if 3)
+				control = l->sidedef[0]->sector;
+				if (l->args[2] & 2)
+					accel = 1;
+			}
+			if (l->args[1] == 0)
+			{
+				Level->CreateThinker<DScroller>(EScroll::sc_side, -side->GetTextureXOffset(side_t::mid),
+					side->GetTextureYOffset(side_t::mid), control, nullptr, side, accel, SCROLLTYPE(l->args[0]));
+			}
+			else
+			{
+				auto it = Level->GetLineIdIterator(l->args[1]);
+				while (int ln = it.Next())
+				{
+					Level->CreateThinker<DScroller>(EScroll::sc_side, -side->GetTextureXOffset(side_t::mid),
+						side->GetTextureYOffset(side_t::mid), control, nullptr, Level->lines[ln].sidedef[0], accel, SCROLLTYPE(l->args[0]));
+				}
+			}
 			break;
+		}
 
 		case Scroll_Texture_Left:
 			l->special = special;	// Restore the special, for compat_useblocking's benefit.
diff --git a/src/playsim/actionspecials.h b/src/playsim/actionspecials.h
index 78f2e87eb..780fb0b8c 100644
--- a/src/playsim/actionspecials.h
+++ b/src/playsim/actionspecials.h
@@ -212,7 +212,7 @@ DEFINE_SPECIAL(Scroll_Texture_Both, 221, 5, 5, 5)
 DEFINE_SPECIAL(Scroll_Texture_Model, 222, -1, -1, 2)
 DEFINE_SPECIAL(Scroll_Floor, 223, 4, 4, 5)
 DEFINE_SPECIAL(Scroll_Ceiling, 224, 4, 4, 5)
-DEFINE_SPECIAL(Scroll_Texture_Offsets, 225, -1, -1, 1)
+DEFINE_SPECIAL(Scroll_Texture_Offsets, 225, -1, -1, 3)
 DEFINE_SPECIAL(ACS_ExecuteAlways, 226, 1, 5, 5)
 DEFINE_SPECIAL(PointPush_SetForce, 227, -1, -1, 4)
 DEFINE_SPECIAL(Plat_RaiseAndStayTx0, 228, 2, 3, 3)
diff --git a/wadsrc/static/xlat/base.txt b/wadsrc/static/xlat/base.txt
index 0fc02739e..d86e3dc7e 100644
--- a/wadsrc/static/xlat/base.txt
+++ b/wadsrc/static/xlat/base.txt
@@ -375,6 +375,11 @@ include "xlat/defines.i"
 438 = SHOOT,		Floor_RaiseByValue (tag, F_SLOW, 2)
 439 = SHOOT|REP,	Floor_RaiseByValue (tag, F_SLOW, 2)
 
+// MBF21 extensions
+1024 = 0,	Scroll_Texture_Offsets(0, tag, 0)
+1025 = 0,	Scroll_Texture_Offsets(0, tag, 1)
+1026 = 0,	Scroll_Texture_Offsets(0, tag, 2)
+
 /****** BOOM generalized linetypes ******
  *
  * The general structure for a BOOM generalized translator is