[paegus]

Sounds like a working solution, if it ever gets implemented.

Though I think it may come across as simpler to do as I half-expected above: Keeping server groups (or some equivalent) and then when you add or edit an admin you get the the one web access group along with separate drop downs for each server group and separate drop downs for each server. Essentially merging the Edit Group and Edit Server Access pages as in the current iteration.

I can't see the database being any more or less efficient either way as you end up with the same data.