deleting all messages in the lj inbox at once

Title
deleting all messages in the lj inbox at once

Short, concise description of the idea
There should be a button to click to delete all messages in the lj user inbox at once.

Full description of the idea
Currently you have to delete each page of messages one at a time, but a "delete all" option, which is used in a lot of message related systems, would be very helpful. It would work quite similarly to the "read all" function, but would instead delete everything.

• saves time
• seriously, it would save people time

• deleting all messages on accident? just add a "are you sure?" box and that's fixed!