Timer for Disarmed mode

It would be great to have a timer for the “Disarmed” mode selection, so that it reverts to the previous model after a preset time (0 / 10 mins / 20 mins / 30 mins / 40 mins / 60 mins)
I switch to disarmed mode to work in the garden or clean the car, but end up forgetting to rearm the mode selection.