Yes Jeff my Nexus is a permanennt install. I tried TIMURs rom on my nexus 2012 and for lollipop on my nexus 2013 but in the end I went with a stock rooted rom. I found a german website who showed how you could put the Nexus to sleep by grounding a pin on a transistor in the Nexus itself. I actually have to rollback to Lollipop as Google broke usb dac output with Marshmallow. All audio is in mono when using a usb dac. I see TIMUR has a new rom for Marshmallow now but I find some of this practices a little shady.