Good for them or something. However I somewhat doubt they’re out of more useful things to do…

Idk, I’m more into re-using. Old pc? A home server! Old laptop? A home server! Old phone? You guessed it, a home server! Alternatively, I can give 'em to a friend/relative if they happen to need one. And FUBAR stuff goes into its own bin in case I need spare components.

In case you end up not finding a solution for river, hyprland can do that: https://wiki.hyprland.org/0.42.0/Configuring/Keywords/#per-device-input-configs