I did some more work on this last night, and I will continue today. Mostly I am shifting code around, and adding a more dynamic way to save data - you will be able to select (with the gui of course) the method for saving data, including file, mysql and built in gmod sql. I will also work on group specific limits and weapon load outs.
And thoron, restrictions are base on groups not rank numbers. Go to the access management tab of the group you want to edit. There you can edit group privelages and what sents/sweps/stools they can use.