Build and Shoot

I have been typing and clicking with no remorse for 22 years now, but for the past year I've had to nearly end all gaming to let my right arm "heal" from RSI.
Being a fan of clicky games doesn't help, but I have found some good tools to use.

Xbox controller and Xpadder works great to stop carpal tunnel pain.
Use a feather touch keyboard (opposite of my old IBM mechanical keyboard). Knesis Freestyle is a good one, and you can tent it to prevent keeping your arms at a bad angle.
Left handed mouse, I learned to use it being right handed, not as good as my right, but always improving.
Vertical right handed mice work a bit, but clicking still hurts.

Any other tips?

As someone who hasn't yet properly recovered, I do have some tips that might help.

For text editing, use VIM. I'm learning how to use fewer and fewer keystrokes to do stuff.
Make sure your desk isn't an ergonomic nightmare. I like being able to rest my elbows on the desk, although I'm starting to worry about my shoulders.
Avoid using the mouse where possible. If you use some form of X11-based unix (e.g. Linux, BSD), use dwm. A laptop trackpad should be less stressful than a mouse.
People recommend using speech recognition. I, however, haven't had any luck with finding anything that actually works, and I am NOT going to be speaking in an American accent.
There are various exercises to do, which I really should be doing more of. Look around and see what works best.

I'm using a standard Microsoft Wired USB keyboard, which isn't too bad wrt the force you apply.

Massage the musscle (located juster under where your upper and under arm connects) and do twist your right hand around.

An ergonomic mouse might help. I have one that essentially holds your hand on its side, and it's really effective and comfortable. Also, it's a tad thinner, so I can decrease my DPI and reduce the twitchiness by a large amount.

Dragon Naturaly Speaking is a pretty good program, I have written quite a few papers with it, and my grandpa, who has a severe shake in his hands due to a neurological disorder, uses it almost exclusively to work on the computer, since he cannot type or use a mouse(also, he has a very pronounced southern accent, and the program does fine)