Seeing the prospect of an Engineer class for humans (Dram has talked about it), able to conduct repairs. If it has not been considered, the limitation of repairs should be implemented. I.e, a maximum amount of health may be repaired on a unit. Say the Hover tank with 13000 HP, could be repaired for a maximum of 26000HP. So you can effectively triple the use of your vehicles, but also prevent players from just running away from battles repetatively for repairs.
Thoughts? For those familiar with Total War: Warhammer and the healing mechanics there, will see what I am getting at.