Did a bit of searching for this but, if it's here, didn't get the right combination of terminology.
There are a few apps that I use regularly that only run in portrait mode (grooveshark for instance) that I'd love to force into landscape even if meant having to "letterbox" the app with bars on the left on the right. Like an SBsettings toggle or something.
It seems like it could be pretty functional. Swiping in the black bars on the left or right moved the entire app up and down. Swipe in the app itself and it behaves as normal.
Has anyone run into something similar? I've searched cydia for "force landscape" - "landscape" and orientation but not seen anything similar.