Another nice maneuver is the inverted flat spin. You need a ton of rudder control to get it good and flat. To do it, get plenty of altitude, then do a half-loop to inverted, then point both sticks at the antenna (full throttle, full right rudder, full down elevator, full left aileron). To recover, just let the sticks go to neutral, let the plane nose down for airspeed, and recover from the nose-down attitude. The more aft the CG, and the more rudder throw you have, the flatter it will go. One word of caution: pull out early until you get an idea of how much altitude you need to recover.

I have a GP Super Skybolt that does these incredibly good.