toggle-key-repeat

#!/bin/bash

up_delay() {
   dconf write /org/mate/desktop/peripherals/keyboard/delay 250
}

shorten_delay() {
   dconf write /org/mate/desktop/peripherals/keyboard/delay 80
}

DELAY=$(dconf read /org/mate/desktop/peripherals/keyboard/delay)

if (( DELAY <= 100 )); then
   up_delay
else
   shorten_delay
fi