I'd used custom shell-scripts for a while though since I saved them with
the exact same name as the actual program I confused myself. E.g. when I
tried to use rofi to provide me a dialog to choose from some options.
So, I discarded this approach :)
I struggled to distinguish between a simple key-stroke and a pressed
key, which should lead to repeat inputs. Initially I copied this value
from my macos-settings where I use the same keyboard, but it turns out
that the timing is somehow different.
Remember set this to 200ms on macos and 250ms on X11.
Note, I have no idea which one is more accurate, but since everything on
a mac feels (and is) slow I would guess linux is correct and apple lies.
