Hi:
I've got a working Full Screen 800x600 using HighGFX and full screen for games (at least here on my 32" FullHD LG Tv).
Here it is attached, and I will explain it clear for everybody: Copy first the
HighGFX files (not complete drawers) to your SYS: Devs/Monitors, reboot, open the Indivision config program on Prefs, make a right click on it's top bar, "Open Config" and search mine. Then press at the bottom right, on "Apply". On Screenmode prefs (on your System:Prefs) select HighGFX SuperHighResLaced, untick the default values (1024x768) and enter 800x600. Then you can edit OverScan on Prefs for HighGFX, and although you won't see the full screen, you can move the left side border to the left as it needs so.
Improvements -
POSTING CONFIG !- of an 800x600 mode like SuperPlus are very welcome.