As for the "Ball and Flag" system given in this and another thread, we have the "Wait for Trigger..." driver command, which, I admit, is hidden by default. Go into the driver commands rule to make it visible. With enough forethought, it behaves in exactly the same way, Just on triggers and has to be inserted for every driver using that single track. Though that only works with AI. Us humans have the layout map.
Having these automated systems would be a help, but there are already driver commands that work the same way.