Love the mod, but I'm getting really tired of having to remove unwanted train stops from my blueprints. The auto-builder insists on making every rail bidirectional regardless of existing signals, and the Traffic Type setting seems to do absolutely nothing. I have found zero way to change it, or how it would even affect the autobuild result.

I do have a function for this. Press the X icon/thrash icon to delete all the extra rails and stations. Then you can make a blueprint. When you say Traffictype, what do you mean?

I wonder if the issue you are having is that it places a random extra station and rails that makes no sense?
It happens if your BP have an extra rail piece somewhere. Find and delete the extra rail piece and it wont make all the extra stations and rails in the middle of your intersection.