"Quick tasks" feature

The application really needs a “quick task” feature (like in The bat! or Outlook).

The concept is straightforward: users can create a message rule that is applied to the currently selected message(s) when the press of a (user-defined) button.

I would use that to handle spam: forward it as attachment to my spam handling service (spamcop) and delete the message from the server. It can easily be used for many other things that cannot easily be automated throguh a trigger (Archive mail, forward it to manager, etc.)