I would like to see more options for editing t-spline forms by vertex/ edge, such as the ability to set the pivot similarly to Alias Speedform's option. Furthermore polygon modellers have constraint options which allow vertices to be constrained to edges, faces or normals. When moving them, they are only able to move along connected edges, on the face on which they reside or along the normal direction. This makes editing t-spline geometry more predictable.