I found another mapping app that works great with the Shield. It is very simple to map the controls. I like this one because you can move the buttons around while your in the game. While game is playing pause it, tap the upper right and the edit screen pops up, from there you can move, add , resize or remove buttons as needed. Save profiles can be shared. I have tried with every game without controller support on my shield, and it works very well. The Shield keeps getting better and better! It is in the Play Store.
hxxps://play.google.com/store/apps/details?id=com.locnet.gktouch
hxxps://play.google.com/store/apps/details?id=com.locnet.gktouch
