In racing mods, for example: rk_f1.tbm
You have the model of a car as your tori, you hover your mouse over to the back wheels and press 'z' it'll Accelerate or reverse, but how come when I hover my mouse to the two front wheels it doesn't say 'Relax/Hold/Contract/Extend Left/Right wrist', so I have to really zoom into the wheel and look for the wrist and click it, how do I fix the wrist 'z' button problem?

I don't think your meant to use those wheels, otherwise they would be the same the back wheels. I could be wrong, It's not my mod. But you can try relaxing all and then just using the rear wheels for speeding up/down

The wheels don't work in the current version, the hand is blocking the wrist joint. Try loading it with an older version.