What prompted all this was the problems that have bedevilled Partisan Forest - people whining about TK's and about other players 'gamma-cheating'. It is a fine map but I want to do everything I can to avoid its pitfalls.
I am not trying to be rude, I respect you and admire your maps and the work of C.Crosses, but isn't that a little like preventing wall hacks by making a map with no walls?
Partisan Forest is a very fine map.
It is vulnerable to gamma cheating, but only in the same way a map with lots of walls is vulnerable to wall hacks.
Sure, if you got rid of walls you would prevent wall hacks just like if you created a completely naturally lit map you would get rid of gamma cheating.
However, a map without walls will be dull just as a map with out dark areas and/or bright areas will also be dull*. *
"dull" as in uninteresting, not dull as in dimly lit.
I don't think you should compromise on any part of your map, even aesthetically, in an attempt to prevent people from cheating.
Your intentions are clearly good, but in the same way that it's not the map maker's responsibility to prevent wall hacks by removing walls, it's not your responsibility to prevent gamma cheating by removing unusually dark and/or light areas.
After all, part of the reason Partisan Forest is such a good map is because of the lighting!