Thanks for the advice! I did already figure out the thing about the trackpads. I found the whole environment to be surprisingly usable in handheld mode, but definitely not ideal.
Thankfully that's not how I'm planning to use it. I ordered a lapdock (specifically this one, which is the only one I've found that ships to my godforsaken country) and it should arrive in a couple of weeks and be the main way I use Desktop Mode. Then I don't need Steam input.
If you’re using a customizer like DeckyLoader holding off on updates for a week or so until there’s confirmation of stability and compatibility is advisable, but that’s more for handheld mode.
Can you tell me more about DeckyLoader and why I might want to use it? Or just link to a page with that info. I never looked into it, and I'm wondering what's actually missing from vanilla SteamOS.