More Rules Tokens?

I'm on the verge of doing some pretty sophisticated stuff with this module, but I can only get about 90% with the limited tokens for event "After adding all e-mails to the spool" for the time being. It appears it only supports one token--the spool count?

Anyway, would be great to open this up a bit, like maybe the other message fields (title, recipient list, etc).

Make sense?

Thanks!