[Feature Request] Map keyboard and other inputs as gamepad.

[Deen0X]

It will be so useful if you can map keyboard and other inputs (mouse) as XInput gamepad, Mixing all these inputs for creating a single gamepad.
Examples of usage:

• GPD-Win will be released, and there is a big problem with their layout. L3 & R3 are away from gamepad controls, and are extremely difficult to use them.
  If we can remap any other keyboard as gamepad, will be useful for proper play many games.
• Other kind of use, there are many gamepads such iPega 9023 that don´t have GUIDE button, but there are other buttons on it (multimedia control). Will be so useful if we can map any of these multimedia keys to gamepad control (GUIDE button as example)