i think that is adjusted by teh "screen size" slider. I have a 120 inch projector screen, but spent a few hours experimenting and found that i got the best effect @ 88 inches. (larger or smaller provided a shimmer or hollow effect)
Some games (such as Socom 4) have a depth effect meter though.
I don't think there is anything in the regular software for the "3d effect" level. There is a slider in deblob 2. I usually play on 6-8 and not really sure I notice the difference between the 3. I'd like to find a way for it to keep my settings, it is annoying to go into the options menu and monkey with the game settings every time I want to play.