possible to have two proprietary nvidia drivers installed?
 

I want to run both World of Warcraft and Steam under wine, but WoW won't work with the latest 195.x.x driver, and steam won't work with the previous 185.x.x driver.

Is it possible to have both installed, and to switch between them as needed for different applications? Or will I really have to choose between one or the other?

I think you'd have to setup two ini files that works as a chooser sort of deal. You'd have to end x and then start x over with new settings. The exact method you'd have to work out. You can have the drivers in the system, your issue is just picking which one. Might have to blacklist them by script maybe.