RE: Newbie question
Well, hey, that's cool!
Can't help on a low-rates switch on that parkzone tranny, I haven't used one. Certainly, though, you could adjust the pushrods to mechanically limit the available throws, but even with stock throws the plane is not excessively twitchy. A certain amount of extra throw is very useful when one finds oneself in an unusual attitude and needs to correct quickly, so be careful about reducing them too much.
You probably would be very glad to pay a visit to the clubs gregoryda listed. If they're anything like the club I belong to, they own a couple glow trainers that the instructors will use to give people a taste of RC flight. Our club instructors work hard to get any visitor who shows up on the sticks their first night out. It helps improve their chances of returning, often with a shiny new plane of their own. Learning by using the club's buddy boxes is also far easier than going it alone.
It's great to hear of your determination to do more. None of us really knows how we would respond to such a devastating injury until it unfortunately happens. Seems you're made of tough stuff.
Let us know how you make out!
J