I thought I had posted an update for 7.1, but none is here. So....
The issue with the screen going black when "nudging" the table has been resolved with Cx Games 7.1. Aside from the ongoing key remapping issue, the game now plays flawlessly under 7.1.
Under Cx Games 7.2, Big Race USA now seems to run a tad sluggishly. The ball animations and the table nudging animations all seem slower than they were under 7.1.