Suggestion: Have d-pad and analog joystick share buttons

[Szarikow]

bad thingie i'm playing my games in full screen far from the monitor using the Joypad and the analog and the other thing have different functions on maaaaaaaaany games

You missed the point entirely.
First: this is for keyboard not joypad (d-pad and analog are usually close to each other on joypads so there is no need for such function).

Second: this is suppose to help you utilize the different functionality of d-pad and analog (which you spoke of) more easily.

Let me explain one more time. Lets say that this gets implemented. You config your keyboard in jpcsp the same way you do now, however when you play and need to use d-pad instead of analog you could just press shift, rather than move your hand to the d-pad buttons (which are still there).