I have this set up
That's fine. Now I would like no letter to do anything when the cursor is in "AXOutline".
I could set up:
"a" does nothing
"b" does nothing
and so on...
Is there any way I can shorten this? No letter does anything?
Thanks 
unfortunately no, shortcuts always only listen to a specific keys - especially with the advanced trigger conditions. I don't think there is a way to make this generic ;-(
Okay, no problem. Just wanted to know