I agree on releasing both edges and in general that is what I? do. I will say that the really advanced move off piste or in steeps is to actually hold onto the LTE from the existing turn longer, while at the same time releasing the downhill ski from the same turn (stance ski). If you actually do this and then tip the old stance ski while the other ski is still on it's LTE, you have a slight moment of bowleggedness and this creates amazing control. This is actually what I work on when doing SRT's on groomed terrain. If you get it right, you can ski any pitch with amazing control and more importantly, you can never get BTE happy, where the new stance ski (BTE) is beating the other ski into engagement (the dreaded stem) which is what kills most intermediate, advanced and aspiring experts in difficult terrain.
Writing all of this has been helping me formulate my gameplan on snow as I enter this season so this is proving to be very valuable for me. The more I think all of this through the more I remember what I have been working on and what I need to keep improving with. Now all I need is some snow!!