Stage one proposal: Add an element for things you press on keyboards.

I often want to add special formatting for things I press/type, such as CTRL+Z or ALT+0235. I know that <userinput> exists, but that generally seems to be intended for strings you put into fields. Also, I generally want different formatting for things I press
 on a keyboard vs text I need to enter.

Right now (because I'm a DITA specialization newbie), I'm using <userinput outputclass="keyboard">CTRL+S</userinput> in my processing. I'd love to simplify this down to something like <keyboard>CTRL+S</keyboard>. Potentially this is just a small addition to
 the software elements domain.

And trying to write this without using the word "key" is hard. 

Zoë Lawson