Not sure if you meant output as arrow keys? If so you can use xdotool command, or as Press Keys you can just enter Up or Right etc.

I think I wanted to populate 'command.' I'm use my Stream Deck as a partial controller for Starfield. Part of the flight model has 6 systems (left and right) and power increase/decrease (up/down). I added up-down-left-right to individual buttons in Press Keys and it works.

Great news! One thing that I opened an issue for still, is repeat key while being button being held down. It does not yet recognise/react on holding a button, which is needed for many games.

Quickie bump to this, the software seems to work except in Starfield. I did a pretty extensive system update today which broke most of what I'd done, updated to 3.2 beta, edited the command to start the game. Nothing in SF worked so not sure if it's a Proton matter or something else. I tried Cyberpunk and the few crossover key commands work in it just fine.

Additional bump, experimented across 3.10, 3.20. All games played via Steam. up-down-left-right work sometimes in Cyberpunk 2077 but only on the esc menu along with wasd. M works in game to bring up the map. BG3 L and M both do their jobs, again WASD/Up-down-left-right don't function. X4 Foundations, linux native wasd/up-down-left-right don't function as the character but work on the map.

@ASCI-Blue X11 or Wayland? More info please.
Hit us up on Discord. https://discord.gg/BRPBSbvaD4

So you are on X11 thanks for the information