What you were asking to do has probably never been done that way because it's so easy to do with usergroups. There are even modifications to add the user to the secondary usergroup automatically when they donate.
Most people just make a secondary usergroup for the donors. Basically you make the secondary group either just like the Registered Usergroup, or make it have hardly any permissions since the bigger permissions in the Registered group would trump the smaller permissions in the secondary usergroup.
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