Thanks for the support TomJ.
Just an update:
I have finally added the feature of approving editors.
Now when editors apply, they are added into a waiting database, and emailed that they will receive a rejection notice or an approval notice. The admin can approve and deny multiple editors at once, and it sends all the messages out. The admin can write personalized reasons for denying access if they want or just go with the standard template rejection notice.
Also, I have added a field in the category.def, called Edit. It is a Yes, No field. If yes is selected, users can signup for that category, and it's listed in the signup page select list for categories. If it's no, it will not be listed.
Each cat in when building will tell you if no or yes is selected and show all the editors of those cats.
This is done by code supplied by PaulWilson. Also, for those with the reference cats that show up in category lists ending with @, they are automatically excluded from the lists.
Anyway, you can see the editor approval thing by logging in as admin/admin. It should be easy to find.