Signal Visibility Enhancement... apply it to only the players route?

[Gazz292]

I wonder if it's possible to make the signal visibility enhancement level option work only for the signals that apply to the players route?   

So instead it affecting all signals as it does now, it adjusts the visibility / brightness of just the signals that are for your train, leaving the signals that do not apply to you at the normal brightness.
kind of how in real life on some railways, the signals are angled so they point along the route tracks they apply to at the sighting distance, to try and stop you mistaking another tracks signal as the one for your track.