Export Groups - Not Equal with "overlapping" and "not overlapping" (both modes)

[Alexx31]

Hello,

I am working with exclusions of Export Group assignments.

And found out, that there would be great to have
"not equal" with the standard mode "overlapping"

REASON:
When I activate one letter "not equal" it works 

But when I want to hide two letters with "not equal" it doesn't work anymore at all.

EXAMPLE   A= not equal, and A gets hidden as expected
A and B = not equal, then A and B keep visible, I guess because it must be assigned A and B, which is anyway the most seldom case

2.)
I personally could use many more letters: Couldn't be there just an additional "letter field", where I can type my own letter - or even string?

Thanks