Just tried again and Shift + L or R is now doing the same thing as Ctrl + L or R, so you and I are on the same page, Tom! Dunno what was up before… maybe I somehow missed the shift key!?
I guess a crazy workaround would be to manually add a fake image that is at the roll orientation you want it to be at, and then align to that when you want to roll to particular orientation! Sure would be nice if there was proper roll control…