[Q] Physical Key support & button setting

[williammau21]

xperia play keys are already supported.
to use a USB or Bluetooth controller you can use either gamekeyboard, or a modified keylayout file.

if you are a developer you can also modify the hardcoded controls in the emulator itself.

But how about embedded QWERTY Keyboard (not bluetooth or USB)?
If I use Gamekeyboard, will it affect performance?

Will PPSSPP add button setting interface like other emulator?