I just thought of something. It would kind of be a nice idea to have the choice to select who you get PMs from sort of like the email feature. The reason I thought of this is because I work for a band and some of the band members have accounts on my forum. The fans PM them like crazy sometimes. So I thought maybe this would be a good idea. Just a thought..

Why don't they just disable their private messengers?

I think this would be a nice feature and would like to see it. Yes, you can disable for "X" member group, but keep the PM open if "Y" member group has proper permissions. :)

True, that'd probably be better than just disabling the entire thing..