Yes... limited characters per message, and total messages would work... but then again there is always the pruning based on age. My thing is I want to keep them all as an admin, but I have hundreds of them, and it makes loading that page a real pain.
Maybe an option to prune PM's by group would work ...
I personally don't see the need for a threaded PM format... PMs are essentially e-mails, and the previous message being there to see when replying is enough, IMO. All threaded would do is enable people to see all of the messages. I've never had that need.
