New category permission - "cannot see"/"exclude"

Contribute Feature
21

I would like to support this. My use case - I have a group of “limited” users; I want them to be able to read most categories, but write only in one, let’s call it “starting cat.”.
I can of course use existing solution (and trust levels of course), but if I want to have more fine-grained permission system, it gets hectic.
Instead of setting up permissions like this:

display: everyone
post: everyone NOT greenhorns

I have to do something like this:

display: everyone
post: Group 1
      Group 2
 (...and basically each and every other group...)
reply: Group a
       Group b
(...and once again...)
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