Edit NURBS > Stitch > Stitch Surface Points >
These are the options you see in the Stitch Surface Points Options window.
If Assign Equal Weights is on, a weighted average of the selected points is performed both in position and normal using an average NurbsSurfacePoint node.
If turned on, all the points are assigned a weight of 0.5. When turned off, the first selected point is assigned a weight of 1.0 and the rest 0. The default is on.