Turn Radius speed with arrow keys
I think they’re unlikely to change the speed of keyboard turning because relatively few people use it, and occasionally there are benefits to having a slow option.
Have you tried using Action Camera mode? It takes some getting used to but I think it might help.
It makes it possible to move the camera, and therefore the character, around just by moving the mouse, without needing to hold down the right (or left) button, which I assume is what tendonitus prevents you from doing. (That’s based on similar topics by other people, but please do correct me if I’m wrong.) The movement is similar to keyboard turning, but much faster (it’s based on the camera rotation speed, which you can change in options).
“Life’s a journey, not a destination.”
I could not play this game without being able to strafe. Arrow key turn is the first thing I turn off or change when I install a new game.