you can wire the trans selector switch and install a door switch with two positions.
Door open steps out close steps in. Switch off with door open and the steps stay down. Two wires to trans selectors witch, to door switch and from step motor, two circuits with shared hot.
You put the trans in gear, it automatically pulls in steps regardless of switch at the door or wherever you place it.
When we first had ours I was alarmed that I had left the steps extended. But I hadn't when we put the coach in gear the steps came in regardless of the door switch position. A safety feature, I though all coaches now had.