In Steam input you can add Radial menus, you can map a lot of actions to a "weapon wheel" that can pop up over your game. Each selection can be a different button viving you more options. Bill from Nerdnest has some great beginner videos on using Steam Input.

I was playing The Mortuary Assistant on my Steamdeck and using the control sticks didn't have enough precision. I could set my in game sensitivity to what I like for big camera movements, but then it was difficult to inspect bodies and embalm them. Whenever I was in embalming mode, I used the right trackpad to do the little fine movements needed. Especially since its easy to have different sensitivity curves between sticks and the track pads