Yes, this would be a VERY good addition to have. Just today, I wanted to have an auto-response to a particular address, email@example.com as well as deleting incoming email for that address. The user had left the company sometime ago, and it was time to stop receiving email for them.
I set up the auto-responder for that firstname.lastname@example.org and then set forwarding (with delete-on-forward checked) to another address in the domain, which I created just for this purpose "email@example.com" which had a Content Filtering rule that would then delete the email entirely. That rule is 1. Flagged as"High Priority + Normal Priority + Low Priority", 2. OR, 3. Delete Message.
I'm sure there are other ways to do this, but this worked for me.
But having that all available in the content filtering (Auto-respond + Delete) would have saved some time, as well as one user-account.