Oh, I get what you're talking about. That was what I was going to do when I we decided I would have a detector at the feet of the player.
Yet, I want the player to be able to move while she is on the platform, so I I am just going to do something like this:
(Detector) overlapping (Platform)
+ Set X ("Player") to X ("Player") + Alterable Value A ("Platform")
where the alterable value A is the X speed at which the platform will move. (interchangeable with Y, of course.)
