I had two types of rudder pedals in the past, TM slideing pedals, and the CH car type pedals. I had to nail the TM pedals to the floor to keep them from moving (that went over real big). I still had problems keeping them centered though. I didn't like the car type pedals at all. After giving away two sets of pedals, I'm hesitant to buy another set. I'm trying a setup where I use the x axis of another joystick for the rudder, as I was having the same problem of inadvertant rudder movements in combat. I tried setting the deadband way up on the twisty stick, but it made it harder to finely control the rudder even after setting the the first 5 bands close together.
The second rudder stick is going to take some getting used to, but the fine control is there, and it adds some more buttons and another hat. It also was a lot cheaper than pedals. I think there were some real life planes controlled with a rudder stick. I saw a design for a homemade rudder stick on a website, and I remember it mentioning a historical plane that used one - dunno if it was a combat plane.
Anyway, thats another option, and probably a great option for anyone who has problems with their legs. The drawback is not being able to use the rudder and throttle at the same time, but I have yet to find that a problem.