Hmmm, touchy subject.
Here is my take on it:
The Hot Shots just need to grow up, build a bridge, and get over it!
There are many things that make a pilot a good pilot and controlling the aircraft, although a very important part, isn't all of what being a pilot is all about. There are Go/No-go decisions to be made judging the weather, reading the elments, and especially when you fly a helicopter you make hundreds of little decisions all the time.
These guys are more than able to control the aircraft, let me tell you. I happen to know the fellow you mentioned who flys a Cessna 337 for air-attack.
This guy is not only a good pilot, but a true inspiration to me. He has done more stuff in his life without the use of his legs than most people have done being able to walk. He owns a boat, skies, goes horseback-riding, and flies planes. He used to be a Vietnam pilot until a helicopter accident finished his helicopter career. So now he's off flying planes. AND he even teaches other people how to fly planes! I'd jump into a plane with this guy any day. As I would with the guy with the prostetic leg. He works River City Helicopters, right? I know him too.
Check out this website
www.wheelchairaviators.org for more info and inspiration.
Athough Hot Shots are known for the hard and dangerous work they do, I don't think they are the biggest thinkers out there and have very knowledge about aviation. I wouldn't go by what they say too much. They can always walk off the mountain if the aircaft or pilot doesn't suit them.
I don't think this has ever been an issue in the pilot world, 'cause this is the first time I had somebody bring it up. . .