Thanks for the response, Dave. I just figured that Nova Launcher which I'm currently using can lock my phone using gestures. Now I just need to figure out a better way to wake up my device without using the Power button. I may try your suggestion though.
Gravity Screen has proximity functions along with many others. I love that I turn the phone upside down as I slip it into my shirt pocket and the screen goes off. Before my M9, Gravity Screen would wake my phone as I pulled it back out of my pocket.