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A slightly different version of the question.. I've been asked by users to be able to PM multiple users at once. Group PMs is a start but ad-hoc user selection is another.
When you are in your Inbox and select a number of messages you can Delete those messages but if you choose Send, those selections you made have no meaning, it is just the normal single user send routine. Might be nice if those selections could be used for a multi user PM. Selecting from the master list would be ok too but the more likely situation is that the user wants to send to a number of users he already has PMs from, easier to select them from the Inbox.