Dave, thanks for the info. I like the two step idea - hadn't actually thought of doing it like that. I realize the module isn't supported by CC, but I was really asking whether the legacy APIs could specifically target a single list from many. I did some more digging around and found the legacy API PDF file you have on your site, and it states the following for the UsubscribeSiteVisitor function: "Use this API to unsubscribe/permanently remove a site visitor from all contact lists." I guess that answers my question with a "yes, it removes a user from all lists". Just below this section are the required parameters and the list is not one of them. Therefore, I can assume that means that the list is not selectable.
Anyway, I'll go ahead and add in some extra processing to do the two step re-registration of a user.
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