Hotkey to switch between ghost and normal track laying

[imajor]

When laying down track, I prefer the direct way when there are no obstacles (because it is faster) and prefer the ghost mode with personal roboport when there are trees/rocks in the way. Hence I want to switch between the two often. Currently I have to press 'q' to exit from the current mode, and click on the end of the track again to enter the other mode (correct me if I'm wrong). It would be much easier if I could just turn ghost mode on/off with a hotkey.