sys-con VS GloSC

Mission Control is only for Bluetooth devices. You can try https://github.com/cathery/sys-con for cabled controllers, but it's a bit of hit or miss

Sys Con is what you’re looking for, you can use this and Mission Control simultaneously.

Only wireless controllers are supported for the time being. You can use sys-con for wired controllers, but it seems to be unmaintained and I can't say whether it works on the latest firmwares.

I think that this one should do the job: https://github.com/cathery/sys-con - seems to have xbox 360 support

Not with Bluetooth unfortunately. If you don't mind wired though, you can use sys-con, but it might take several tries to connect the controller.

Maybe sys-con but only if your controller is USB and compatible. https://github.com/cathery/sys-con

Not sure if it'll work, but... it's worth trying https://github.com/cathery/sys-con if you can grab an N64 to USB adapter off Amazon. Sadly, Mission Control doesn't support USB yet. If you had an N64 to Bluetooth adapter that might work with Mission Control too, but AFAIK they only sell the reverse thing (bluetooth receivers you plug into your n64 to use a modern controller).

MissionControl for Bluetooth and sys-con for USB

For GTA V (I have the "Epic Store" version), I just added the "Rockstar Launcher" as a "Non-steam game" and it worked with no issues. I had to use GloSC for Genshin Impact and other games.

I had an issue where my PC viewed the backbone as keyboard inputs, so I had to use this GitHub project and it works flawlessly now. https://github.com/Alia5/GloSC I just do a blank one, not linked to any games, and launch it on my PC via Steam before I plan on streaming on my phone.

GloSC

You could try this https://github.com/csutorasa/XOutput that seems to work like xc360 but works with UWP, or maybe https://alia5.github.io/GloSC/, to open UWP apps trough steam and use the steam controler interface to assign the buttons.

I think you might need this to get it to work https://alia5.github.io/GloSC/

I mean the SC is not tied to Steam. Lots of games I play with the SC I start as a non-steam game from Steam and it works fine. Also https://alia5.github.io/GloSC/

I just setup Steam link for the first time, and was disappointed to find that when I launched an Origin game, my controller would default to it's Desktop Mode inputs. Same thing happened for an Epic game. I've seen people suggest various third party software (OSOL, GloSC), but what I did was remap Desktop Mode so that instead of RT being click, LT right click, LS the mouse cusor, etc...... RT was RT, LT was LT, LS was LS, A was A, B was B, and so on.

GloSC (Global Steam Controller) Github page

Download link: https://alia5.github.io/GloSC/ Youtube video explaining it: https://youtu.be/YAbOiol-2B8