Asst Admin can change signatures

[TLCanna]

I have created a special group is that I call Assistant Admin, in that group id, they have access to admin area, but it's a limited view.

I have a big problem with users who try and advertise for free, my Asst Admins would like the ability to remove the ad links. In essance, have the ability to UPDATE signatures of regular members.

Here is the limited view that they can see, it looks like all the hack would require is a submit button, to update.