Well then, our fortunes have reversed. I discovered a couple of days ago that trying to run doom now freezes my gemei and I have to turn it off and on again.
Congratulations on getting it to work.
As far as I know, you can't set the shoulders to anything. I tried the same thing. 'Y' shoots, 'A' is the 'use' key and 'B' changes weapon. As far as I can tell, they are the only buttons recognised.