There you go. Find a unused back contact of the floor you want to home and a timer to activate when car is away from landing after a given time. Once timer sets it will place a 300 call to start car to landing. Almost like a NDR feature (intense up demand) relay... I would temp. wire the feature and try it out. It won't be perfect, but better than rewiring controller and you can return it back to original dispatching fairly easy!