This works by now. I use it for my big tankers landing on Minmus to refuel. Just edit the "Gear" action group, add the KAL-1000 and set it to togle play/paused and togle forward/reversed. Et Voilá, nice big 5m long landing legs controlled by the "G"-key.
Edit: The landinglegs will work even better with the new Girp Pads (I hope).