A useful feature would be a a button or menu added to WP Admin Bar so you could reset the cache for the content being viewed on the front end of a site.
Ironically had this today. With tropical storm Don spinning in the gulf of mexico. We post alerts from an WordPress emergency site far away. This is done via RSS, so I have two resets, one for the RSS transient and a second for WP Super Cache.
I know I really need to cook something up with the dynamic tags, but this idea hit me as an easy hookable procedure for my users.