I switched to newsbeuter a while ago after waiting for the Reeder update way too long, unfortunately I never figured out a way to setup a proper "open this in my default browser in the background" shortcut so I guess I'll give Reeder another shot. I hope the update is coming to the MAS as well. Bought it a while ago and I'd be hesitant to pay again for a software which was functional for a year and felt abandoned after the Google Reader shutdown.
Despite being a long time Reeder fan that used the app daily on the iPad and happily paid for v2, I recently switched to Mr Reader due to the lack of Updates and the rather barebones state of Reeder since v2. Unless I missed something very obvious there wasn't even back/forward navigation when navigating a web view in Reeder.
While Mr Reader's design isn't quite as clean and I preferred Reeders sliding panels/views, it's as rich in features as a daily user could hope. Especially when it comes to supported third party services and apps. There are in fact a dozen third party that you can choose from in Mr Reader for iPad.