Toggle Option for left and right shoulder buttons

[Activision]

Hey.
I have got an suggestion for the PPSSPP emulator for android.
It would be nice if an option to toggle left and right shoulder buttons could be added.
So you wont need to keep your finger all the time on the left or right shoulder button.
One tap would be enough, so it would recognize the button as pressed all the time, until you press it again.
This would make controlling games on an touchscreen much more easy.
What is your opinion to this suggestion people?