Tank Shock? Pshaw! How about ramming and running them over! How about a Strength 7 hit causing 1d12 wounds from getting hit by my rhino?
Crew that can survive the destruction of their vehicle.
Split targeting: The guy with the missile launcher doesn't need to shoot the same target as the rest of the squad. Also, if the guy with the move-or-fire heavy weapon doesn't move, he/she/it can still shoot, even if the rest of the squad does (assuming the squad maintains coherency).
Vehicles that are faster than the infantry.
Random missions.