I dont like using perk points to repair non-perk planes. Perk points to repair PERK planes would be really good to have though.
What would be cool is to get more points if you get, say, more than 3 kills per sortie. A modifier of getting a 1.5X points per kill after the 3rd kill would then make people want to not only fly smart (aka, no quaking), but to want to nurse their rides home and LAND. =).
During the Repair work, the pilots should also be allowed to change their ordenance (from Fighter to Fighter Bomber, etc), as the plane is in the hangar.
Merry X-Mas!