[Feature Request] Add support to map motion controls when no motion control source is present

[HimanshuBansal112]

In games like Splatoon, it is hard to play game while using a controller(without support for motion controls) for game and mobile for motion controls. A better way, would be to have a way to map motion controls. For example, allowing a way to map when pro controller is moved up, with W on keyboard or with right analog stick on a controller. This would make it a lot more easier to play Splatoon.

Edit with more detail-: It would also be better to allow motion control command given to be permanent or temporary in option. For example, I have to move camera up in Splatoon, by moving right analog stick up will be temporary, as when released will reset and could be an issue as I will have to keep the right analog stick up whole time so it should be permanent. Using reset camera again and again could also be inconvenient during battle. If some other game needs motion controls temporary(for games like Mario Kart), the workaround could be is to have both temporary and permanent effect option for motion control. Sorry for editing after this much time.

[FakeMichau]

You can use motion controls using a mouse so it should be possible to use steaminput to make right stick act like a mouse after pressing come combination of buttons to emulate motion controls using a stick.

But a builtin way to do that could be helpful