"On my current layout, I use the magnet of the uncoupling tracks to indicate safe parking zones. If a train is covering the magnet, then it must be moved in order to allow another train safely pass on the turnout."
Maybe I am reading too much into this, but could you explain a little on this one?
The magnets in the uncoupling track make a big bull's-eye and can be seen from a distance. If a train is spotted between two uncoupling tracks, then it won't foul any passing trains. If any part of a train is covering the magnet, it's a visual cue that it needs to be moved. Below is a graphic which should help clear things up.