This is a great feature, for admins that have bad users, but don't want to suspend them, or ban them.. ;D
There should be an option, when editing a members profile through to ACP, there should be a link named user Mask's.
What will this link do? It'll take you to a screen where, it'll be just like forum-based permissions, but user based. For example:
Can post in forum General Chat? Yes | No
Can post in forum Feedback? Yes | No
etc..
Also, User CP-based permissions, for example:
Can use a signature? Yes | No | Limited
How many chars? (Only applies if the above option is set to limited. {textbox}
Can use Avatar? Yes | No | Limited
etc...
Really helpful. 8)
My "User Based Permissions" mod may do at least some of what you want. Check out my package server for info. It lets you change permissions on a individual user basis...