Having all users have the ability to edit tags, at least all users over a certain karma threshold, sounds to me like a good way to have this get done without subadmins. So what am I missing?
Sure, a karma threshold works great for stack overflow (though it has lots of other details to encourage the OP to get it right). But I don’t think eliminating the ability to pick the subadmins saves you much programming effort. (It might be worth it to save administration effort.) Also, you need a change log to detect abuse of tags. SO does this by putting tag edits on the main change log.
Having all users have the ability to edit tags, at least all users over a certain karma threshold, sounds to me like a good way to have this get done without subadmins. So what am I missing?
Sure, a karma threshold works great for stack overflow (though it has lots of other details to encourage the OP to get it right). But I don’t think eliminating the ability to pick the subadmins saves you much programming effort. (It might be worth it to save administration effort.) Also, you need a change log to detect abuse of tags. SO does this by putting tag edits on the main change log.