Hi adam - actually meshing does already follow the isocurves of the surfaces being meshed.

The way meshing works is by first creating a quad mesh which is in the UV space of the surface - all the edges of those quads are on isocurves of each surface being meshed.

An isocurve has a particular meaning for a NURBS surface - it means a line of constant U or V in the surface's parameter space. Picking a line of some other orientation would no longer be an isocurve, isocurves are only either horizontal or vertical lines in UV space.

- Michael