Haha reversed ailerons, I've seen that on so many flights, both maidens and otherwise at my old field. I even did it myself once or twice when someone messed with the servo reversals on my transmitter. We had some pilots that were actually pretty good at dealing with that after the fact. There was all kinds of sloppy stuff going on with maiden flights. Some guy flew a 40 size trainer with 1 rubber band on each wing (I typically used about 12 total). It was pretty spectacular when the wing came off at altitude.
That corsair is spectacular, really makes me miss flying these things. I'd love to see how it handles stalls and spins, I didn't see that on the maiden video. I had a friend who had a pt19 model that could do the most impressive flat spins, they could be pancake flat and fast turning with very slow sinkrate. Most of the other warbirds I'd seen would just drop like a rock in a spin.
Glad to hear of a well designed ARF. I once bought a Zero ARF from some guy who was in over his head and it turned out to be ridiculously poorly designed. The company that made it had it discontinued only a few months after it's release. It was a .40 size plane but the kit always came out RIDICULOUSLY tail heavy, with an incredibly oversize elevator assembly. On mine, I put a Saito 90 four stroke in it (tailheavy so why not), and still had to add over 2lb's of weight in propeller hubs and firewall weights. The bird came in over 10lbs and I had the elevator travels measured in millimeters. It was sooo touchy on the elevator and would snaproll with basically no warning, it needed a really hot landing speed. Was fun while it lasted but eventually I killed it coming in a tad too slow on a landing. It also used to break props constantly because of all this.