When adding breaklines.

You can not use pan or zoom function - only mouse wheel zoom.
You can not add more breaklines to an existing set. Typeing in another set, ....

Also, option to choose which set of breaklines to apply to a surface
without haveing to create a whole new surface (that has been cleaned and edited), or...

copy surface, and then create a new breakline set.

Option to delete complete set of breaklines.

Option to delete the surface.