With the current instability modeled directly into the 109s? It's not possible. It was possible in AH1, but not in AH2. The 109s are porked, somehow. They flop horribly at all speeds, and especially slow, so you can't hammerhead -- you're too busy preventing the flop, preventing the stall, which you can't avoid. Without that flopping, that instability, you could do the hammerhead. Alas, it'll never be fixed.