Ways to modify milestones

[Luckdemon]

I had a road system that went from my house to my cave, and another road that went from house to a river.
Road 1: wooden posts, house -> cave
Road 2: wooden posts, house -> river
I tried replacing the posts with a milestone and then connecting them. It worked for 1 but not for another.
So now I have
Milestone at house that connects to the wooden posts going to cave.
and that same milestone connects to the start of the river path.

Through enough shenanigans, I managed to get it to work and connect, but it left me with a duplicate road on the milestone that only goes halfway and is a nuisance in an already crowded flower menu.
I'm asking for a way to manually "remove" connections to roads. So I can delete this 2nd road without having to destroy every milestone I've built and redo it.

[Granger]

That would be nice, but could be abused.

[Sevenless]

That would be nice, but could be abused.

I was thinking of suggestions along this line, but that was also the conclusion I came to.