yeh but then you're on the members honor that the user is being abusive in pm's if you can't validate it...
It's not like you can't read the pm's... as an admin you can "become" the user and read their mail, or you can poke through phpmyadmin, so it's not like they're completely hidden from the admin to be viewed in the first place...
My sugguestion is meerely so that users can flag a message for an admin to sort out the users in an easy manner; you are afterall responsible for your users safety and spam on your site...
