I am unable to keep up with my Imbox

I get hundreds of emails per day. My Imbox is manageable when I am home, but when I travel or am on vacation, it fills up fast and becomes too much of a chore to go through.

I have asked support to clear it out for me more than once, but it would be a great feature to be able to mark all as read.

One more thing, I love the bubble-up feature, it is very useful!