Yeah, I don't believe you need that many either. By the way you can connect/disconnect a line between 2 nodes by left clicking on one node then right clicking on another.
I believe your way border lines may also be a bit too close together in some parts.
I also highly recommend adding the scaling points outside of your way borders. You could also have actually split up the stairs/upper floor way system separate from the rest of your scene - or maybe disable character scaling while they are on the stairs/upper floor.