The idea is interesting, and I think it could be very beneficial to certain kinds of squads... (I.E. squads that do a lot of mission oriented play, etc.) It would also be beneficial to new players, as they could actually get training on perked aircraft while getting MA experience. In my opinion, a lot of players join squads to learn and get better, as the group dynamic can be very helpful with learning to play the game.
My one beef with the idea isn't the abuse per say, but the lengths HTC would have to go to, to prevent such abuse. That reason alone makes me think this wouldn't really get added to the game. However, it's a cool idea, and if done correctly, I think it would have more positive impact than negative.
<S>