It would be nice if we could rotate the environment along the vertical axis. ;)
True, that sounds pretty great!
One workaround I've done is just rotate environments 180 degrees in Photoshop if there was a need for strong light from beneath.
However, being able to completely rotate the environment sounds like a great idea!
+1 !
Were it even only to be able to control suns inclination when you work with hard shadows ...