I used it for about 3 days on dvd version and every key/function worked, with some eventual problems like:
-health doesnt fully refill
-god mode doesn't work sometimes
-F5 only shows the menu when game is windowed, and drops fps significantly
-rarely superjump doesnt work / crashes the game
I think you should find a new key for bouncing the car, i'm used with C for reversing. Overall i like it, it's the only menu i'm using right now.