[Zope-CMF] how to edit portal_memberdata on behalf of CMF members?

[Wostenberg]

I keep a number of special properties in portal_memberdata in CMF, which 
are calculated (like membership-date, expiration date) and not 
modifiable by members. Sometimes I need to edit these on behalf of the 
member.

Is there a tool I can use out of the box CMF to edit properties of 
portal_memberdata without loggiing in as the member? Or do I need to 
develop a form similar to personalize_form, and login as member?

-Alan Wostenberg
ora et labora          http://www.psalmweaver.com