Vehicles can be a bit of a hassle to drive on different maps because of terrain variance. The M3S for instance works great on Chernarus but does very poorly on Sakhal. Giving the ability to modify the vehicle's settings would allow server owners to have control over how vehicles perform on their particular server.

Driving vehicles through different terrain types.

Create a file structure that would allow community server owners to modify vehicle stats such as manual/automatic transmissions, gear ratios, rpm, speed, etc. that would override baseline game file settings. Files could possibly be implemented through cfggameplay.xml and use custom xml's to modify such settings. A 0/1 or true/false flags could be used to determine if a vehicle's settings data is read from base game files or from the custom xml's .