As a room owner, I occasionally find it necessary to get non-germane content1 out of a chat room quickly. Fortunately, there's an excellent Move Messages button that works quite well.
I can even move multiple messages at once! Except, well, I use a Mac. And that means I can only move consecutive messages in a single action. Everyone else can choose nonconsecutive text all willy nilly.
Y'see, Ctrl-click is identical to Right-Click on OS X. It should be trivial to also trigger for ⌘ Command-Click, which would be the standard way for mac users to select multiple items.
That'd be swell. Real, swell.
Incidentially, this is actually a fairly old dupe, but the new rules mean that closing this question as a dupe of that old one would be inappropriate. Might I recommend closing the old feature request as a duplicate of this question, once it's resolved?
1 I.E. Pony gifs.