First of all great plugin.
I have just built our field hockey club's new website (http://www.tigers.asn.au) and we have around 200+ players. We intend not to allow anybody to become a Public Subscriber but force a new subscriber to become a Registered Subscriber which will ensure better control for us. To get the 200 players on to the posting list I will be uploading them as Public Subscribers. I don't expect all of them to become Registered Subscribers hence the problem of them getting emailed posts in categories that don't relate to them. Is there some way as an administrator I can set categories similar to Registered Subscribers for these Public Subscribers? The other alternative is to upload them all as Registers Subscribers but there isn't the same facility as there is in the Public Subscriber area? Can you please help?