Setting L2 and R2 in the GUI is problematic on Linux / SteamOS

[kwyxz]

Quick summary

Using the GUI and going through the Controller Manager, attempting to set L2 and R2 on Linux is very hard, with the triggers registering the input only for a fraction of their course

System Details

• Debian Bookworm with wired Xbox 360 controller & Steamdeck with latest SteamOS
• Play! Build Linux #2281 (using the AppImage from Github Actions)

Issue Details

Running Options / Controller Manager then either "Config All" or double clicking on the field for L2 / R2, then attempt to map those to the controller triggers : the trigger needs to be on a very, very specific pressure level to be detected (either as Btn-2 or Btn-5) and keeping it in such a state for 3s in order for the UI to register is tedious at best. Not even sure the triggers work if set manually in a config file, to be honest.