Hello!
I, too, am a physically disabled gamer that uses the on-screen keyboard a lot of the time when playing games, and I haven't played this game enough to notice this issue because I've been having other issues with it at the moment but I hope they fix it soon!
Have you ever heard of a program called Dragon NaturallySpeaking? It's a speech to text program that also allows voice commands, just by speaking into a microphone. I use it to play games like path of exile and Diablo 3. It might make things a lot easier for you, because it has for me! Heck, I'm even using that program to type this out right now
