Added, Draw Lines mode: added "Remove First Vertex" action (Ctrl-Backspace). It removes the first drawn vertex from the drawing session. Renamed "Remove Previous Vertex" action to "Remove Last Vertex".
Changed, Classic modes: added a limit on how far the view can be scrolled from the editable map area.
Fixed, Drag geometry modes: in some cases incorrect vertices were removed when using "Replace with dragged geometry" drag mode.
Fixed, Game configurations: sector special 195 ("Hidden Sector") was missing from Hexen/UDMF specials list.