cba to read every post.
anything that could give you an advantage to other racers who don't have $$ should stay free imo ( /f, /vr, /nc, /sos ...). It would be almost the same as cheating or bug abusing... just that new players will get pissed off and leave.
Rims, /tm to cost money is a good idea imo (would need to add the price near the name of the rims)
entering in /buildmode should cost money too imo, and getting a race deleted to cost money too?
weapons in /myweapon, or fighting style to cost money too? and same for /myitem.
Pay for the buildmode licence test.
And about the prices, make the same price of rims or hydraulics than in transfender, and try to make money not too easy to win.
Name changes should cost money, and quite a lot imo, so people won't change name too many times.
Maybe a low entry fee when trying a race in /TT ?