Hello Sean,
Here's what I might do in this situation:
I would create a Dynamic View that pulls in all users with the Role you specified. Then create a Hyperlink in the Dynamic Views template "Manage" that points to the page with your Registration form and passes:
?Manage=True&UserID=[UserID]
This will allow you to filter only users with a specific role and manage only these users.
Sure it's an extra step, however I feel that this would be a more efficient workflow. If you don't know what Dynamic Views is you can download a trial version from here:
http://www.datasprings.com/products...iews-trial Let me know if you have any questions.
Thanks,
Ryan