patch offered to allow (optional) "anonymous" subscriptions

We've been using lm_paypal at http://ardour.org/ for a number of years now, and are in the process of moving the site to Drupal 6.x. As a result, I've had to reapply the work I did to the original 4.X lm_paypal to allow what we call "anonymous subscriptions". Of course, these are not really anonymous - the term just means that a person is not required to become a site member in order to sign up for a subscription. We still get an email address etc. from the paypal IPN. I've attached the current patch - note that this has not yet been fully tested, but I wanted to float the idea to see if it was likely that it might be incorporated into the official module. There is a single define near the top of the single patched file which defines the anonymous UID - if this is set to -1, then there can be no anonymous subs. In my patch, its set to zero, meaning that anyone on the website but not signed in can sign up if they choose to do so.

I welcome comments on this patch. I am not familiar enough with drupal at this time to push the option to allow this into the lm_paypal admin section.