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you can use the auth section of forum - profile - tabs and menus to control access to a tab or menu...  you cannot directly do it by users though as its an auth (permission)...  so you would put in there an existing permission (see forum - permissions - manage permissions) to see your current list...  take a look at the signature menu under profile and you will see it already checks the auth for using signatures...

I suspect that wont give you what you want so you would need to use the permissions api to create a new permission... thus you could create a permission for each menu and or tab and then only grant that permission to specific usergroups that you want to be able to access that menu or tab...

a new permission is easily created by using calling the create auth function...  here is its prototype:

function sp_add_auth($name, $desc, $active=1, $ignored=0, $enabling=0)

you could do that in your sp theme spFunctions.php template file...

I have thought about adding a create permission api in the admin, but its not there now...