SCH is definitely on the higher side of class button counts. While I'd hate to have a huge ability squish, I'd agree something needs to be tweaked in terms of accessibility.

That said I don't have any problems with the current setup. In fact I love classes with lots of buttons. I've also got a 12-button mouse, which I use to supplement keyboard layout. A big part of it is making sure I'm using as many keys as possible. I currently use

QERTYUFGHZXCVBN12345 F1 F2 F3 F4 `
and
SHIFT+
QERTYZCVBFG

Plus ~6 of the 12 buttons on my mouse.

Which winds up being more than enough to map to. However I've heard folks with smaller hands can have trouble reaching some of those keys.