[Android] vol button configured as control

[cyclonmaster]

Now, we can configure a hard button on phone as a control for PPSSPP.
I did use vol+ and vol- as a R and L button. Quite useful when playing Pro Evolution Soccer and FIFA games.

But, it's quite annoying because the volume also going up and down. The volume level pop up and covering the screen while playing. Is it possible to bypass vol button function and let it used by PPSSPP only?

Phone: LG Optimus 3D Android 4.0.4