I think it might be an interesting idea to add neat and perhaps unrealistic aspects to driving certain types of vehicles, for instance: drifting with humvees or maybe doing wheelies with the ATV, something that may raise the skill ceiling and make it more enjoyable to drive these otherwise undesirable transport units.
Though i do think that the armored transport like tanks and IFV's should stay realistic-ish, as they are more fun to drive that way.