BACK button Gesture launcher does this. But there's no paid version here in mobilism.

[GuyInDogSuit]

Root, install Xposed, and GravityBox. There's options for the navigation bar.

Not really what I meant. It's more like using gestures to activate nav buttons one handed.

Try it out. I can't find any alternative.

[GuyInDogSuit]

http://www.addictivetips.com/android/na ... n-android/

Or https://play.google.com/store/apps/details?id=com.suphi.swipenavigation

Or https://play.google.com/store/apps/deta ... ures&hl=en

Thanks! I'll give those a try.