Kind of in the line of Caveman Nick;s thread, the one minute delay is cumbersome, particularly when dealing with having to send the same PM to multiple people or respond to a multiple PMs in quick order.

Other than possibly a premium account, if even possible, as CN suggested, any possibility of maybe allowing the creation of groups for PMs, or something along those lines?

There are no "member" vs. "non-member" distinctions in the forums. So building in specific member only functions isn't possible. Or desired.