Core Bulk Email Module

So I have used other tricks out there to allow non-admins to use this code to send out emails and it works great...

We use DNN in an Intrnanet environment, so we never delete users, just unauthenticate them.  the bulk email module does not check that peice of the user profile.  Any suggestions or help to give me on modifying it to check against authorized and unauthorized, the return emails are killing me!

I would like to modify the code to add a check...Unfortunately, you cannot remove a user from the registered users role when it is setup as the default auto-assign.  Or at least my install won't!