Suggestion: Affiliate Plugin

Just a quick suggestion for the Affiliate Plugin.

Having a "Supporter payments settings" for free signups as well. We'd like to offer affiliates a payout for each new member that signs up, even before those members become "supporters".

Not sure how many others out there would find this useful as well, or if we're just an odd duck, in which case we'll go ahead and code it in just for ourselves.

Thanks much as always guys!