Few bugs in scene - many warnings in console and seats not working.
Car handle unrealistic (it freaky big and lightweight).
Interesting controls but suspension/transmission sux (it strangely shake, low power). So only 8/10.
Nice try but it can be better.
No need in many hinges - increase suspension bars density instead.
Track chain and "gear" wheels sux. Try to make something interesting in that area.
First thing that I've upload was a tank too, but I've spend 2 week (or more) on it. Always try to make something new or better than others, otherwise - who need it?
I think you don't get it.
That "ballz" property useless - it not saved with scene. Trick works then you use controllerAcc or similar "unimportant" variable.
One thing makes me unsure about it - how you manage to change code of scene and put initial value of "ballz" in .phn file... if I try open-save this scene - it lost.