For one, I have TrackMania Nations Forever installed both on win7 host and win7 guest. On the guest under Workstation 10, with the car set up to accelerate from Right Shift or Up Arrow and steer from left/right arrow keys (not numpad) using wired keyboard 600 usb, the game only recognizes one key at a time in the guest. Eg. I press RShift to accelerate the car, then immediately when I press left or right to steer, the car stops accelerating which in this game results it stopping really quick.
I also had to launch the game through the TmForever.exe as the TmForeverLauncher.exe does some sort of 3D graphics check that takes long time and results in a failed check. The game itself works fine except for the keyboard issue.