[Request]Optional disable BACK key calling out menu

[cai_miao]

Subject: [Request]Optional disable BACK key calling out menu

I'm using a device with hardware gamekeys on it(it's JXD s601). Before git releases the key mappable version, I must edit the key layouts to fit the emulator(because we Chinese preferred Nintendo layout, that is Triangle to X, Square to Y, Circle to A and Cross to B).

My device has a very limited key. Expect for 12 hard keys with analog(no drivers, mapped to D-PAD, still 12 keys), just 2 keys left(Menu and Home key). Because the original layout maps BACK key to the Cross button, and I have to replace the HOME button. And then I cant freely back to my launcher.
I hope you developers can make an optional setting that disables BACK key, only MENU key calls out the menu.

Sorry for my little English, and my expressions.
Hope for your replies.