This is far too nasty of a hack and not good behavior in the first place.

I'm fairly sure you can do this in Lua if you REALLY want this kludge.

src/MusicWheel.cpp

@@ -1511,20 +1511,13 @@ void MusicWheel::PlayerJoined()
 	// a song that has an illegal stepstype for the current amount of players.
 	// (e.g. a song that only has doubles difficulties and a second player joins.)
 	// We need to rebuild the wheel item data in this situation. -aj
-	// TaroNuke: Is at some point this going to remove the non selectable song/course choices?
 	if( !GAMESTATE->IsCourseMode() && !PREFSMAN->m_bAutogenSteps )
 	{
 		FOREACH_ENUM(SortOrder, so)
 		{
 			m_WheelItemDatasStatus[so] = INVALID;
 		}
-		// TaroNuke: Refresh the screen - feel free to replace this with an actual reload screen function
-		SCREENMAN->SetNewScreen( "ScreenSelectMusic" );
-		// RebuildWheelItems();
-	}
-	else
-	{
-		SCREENMAN->SetNewScreen( "ScreenSelectCourse" );
+		RebuildWheelItems();
 	}
 	SetOpenSection( m_sExpandedSectionName );
 }