Unsubscribe redirect using custom tags

Hi i was wondering if it's possible to use the unsubscribe redirect with custom tags so that when i use the [unsubscribe] tag it will substitute some other values...

Ie i wanted the unsubscribe to unsubscribe on campaign monitors side then redirect to something like:

http://www.somedomain.com/Newsletter.aspx?_function=optout&userID=[UserID]

where [UserID] is uploaded as part of my subscription list and will be a GUID as text...

is this possible?

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