select all by a particular sender... in order to efficiently delete loads of emails
From the "Select messages" drop-down arrow, allow the choice of entering a specific email address. This would select all emails from this email address allowing the user to delete and efficiently clean house on spam or senders that are no longer useful.
You can just search for all the messages sent by that sender/email and then use the checkbox selection to check all and delete. It takes 20 secs max. Why do they need to create something to do that?