Yeah, honestly I'd say if you can get aurora working for win executable games through big picture that'd cover a ton. And people can just change native games to use the win executable instead too. Forget native nix games. Really hope it works for you.
If you need beta testing I run Manjaro for my distro which is Arch based just like the deck. Obv don't have a deck yet, but I do have game pads to test from big picture. And am also in that weird ven diagram of people who game on PC/ use linux/ use game pads. lol And for the extra bit of idiotic hipster I use a steam link for playing on my TV in the living room when friends are over. lol Just the stupidest minority you can imagine. lol
Honesty want this to happen and work for people. But if it doesn't, it's no skin off my back either. Certainly not the end of the world for me if it ends up being a dead end. And I already feel like I've gotten more than my moneys worth with the life time sub I bought forever ago.
1. How should users be able to launch/control/switch to Aurora in big picture mode on Steamdeck? From what I've seen there is absolutely no way. The only way is switching to desktop mode and even there Valve was too lazy to add something simply like a way to alt+tab without having an external bluetooth keyboard. I'm more than sure they don't care or didn't think of people want to run something next to their game.
2. As long as there is no way to launch an app within the same instance of another Proton app (so they can see each other processes), it doesn't matter if its a windows executable or native game. Because a native version of Aurora sees both. If anyone knows a way though write me a PM please.