Another option to consider it two or three levels of combat competitions, beginners, intermediate, and Master Class, with the rules and regs needed for each.
Beginners would be for instance 'run what you brung' as long as it's box stock and Tamiya IR compatible. Intermediate would be speed adjusted, turret speeds correct, etc. Master Class would be Turnigy or equivalent, IFA on JT etc, absolute correct off road speed, main gun elevation and depression in prototype specs, turret speeds in prototype specs, the specified IR range for your tank, and whatever developements available at the time for the varied armour thicknesses of front, side, and rear in regards to hits in same.