There's acually an MMO called Identity coming out that looks like GTA with the cop mode and other RP mods. Don't know how they are going to stop major griefing with the police stuff if there are public servers, though.
In ATS yeah. I think I could probably tweak it out with enough time fiddling the camera settings but the game isn't designed to support three monitors natively and the camera editor is literally a text file with horrendous instructions.
Most other games render just fine except for cockpit view in GTA which has no FOV adjustment.