Their sales person said the switch will stay in the position until it reaches it limit so you do not have to hold it down.Hmm...I dunno if that switch will do it. It says it operates like a power window switch, so I think you'll have to hold the button.
Also, it says that the limit switches arent movable, so that might make it difficult to cut it off at 6".
How many wires are coming out of the actuator?