Rail and signal ghost placement

[Wolfolo]

Since 0.13 brought blueprint books I can keep the inventory almost empty and make use of the construction bots to do everything.

It happened many times that when I designed a new railway line or a station I put every single signal in a wrong way because with ghosts you don't have the helper to place signals. I know I can blueprint a whole station and just paste it everywhere I need it, but I would have to make enough blueprints to fill a book just for stations and rail pieces, instead of just the "modules" I made (like a gate with walls and hazard concrete, a loader/unloader with chests and inserters) to be able to build the layouts I want, also most layouts need changes to fit the building site with longer or shorter loading platforms or waiting areas or different entry points.

Since ghosts for electric poles are already aware of other electric poles (they show the cable), wouldn't it be possible to show also the helper gui for the rails?
What do you think?