Just a thought but why not have an option to take out a "Flight" of Tanks (only) much the same way bombers are currently taken out in groups of three. This would greatly enhance the combined firepower and ability to to hit hard targets as well as make for some epic tank battles with only a few combatants per side.
This would be a horrible feature for smaller faster vehicles and create problems with Antiaircraft in clusters so I would limit this feature to Tanks if possible.