Classifieds: automate giving credits by member class?

I'd like to make it so that my Premium members get a batch of bonus credits to use with Classifieds. I understand I could gift these credits manually for each Premium member, but that solution just doesn't scale.

Is there a way to automate it, so that when someone identified as a certain member type gets X free credits?

(I use S2Membership for my member level classes. I obviously do not expect WPMU to support the plugin, but I'm just wondering if Classifieds can recognize member classes.)