Crossover customized X server can handle RANDR from Wine correctly. Xquartz does not... it can only run things at current video resolution. With Wine, if you run anything in a virtual desktop, then Wine can resize the virtual desktop and it will not error. To play fullscreen the way your doing it, you'd need to set up your Xquartz for fullscreen mode... change your Macs resolution down to the right resolution... start Xquartz... kill quartz-wm, then start the game in Wine, and it would look perfectly normal like a fullscreen app. You could also just try making it into a .app using Wineskin (http://wineskin.sourceforge.net), as it takes care of monitoring and changing resolutions and everything for you.... still without proper RANDR, but it at least makes it a bit more bearable.... if you want any type of fullscreen gaming.
