Hey Rich_Art,
"""""""""""""Cool. No idea where to use it for but it is a great option to have.""""""""""

There are a few places where someone may want it, but as a base, it will be good for "flow". If you are trying to match thins up using flow, it is best to have the origin/target curves/surfaces be the same size. Coupled with the same "Point structure", things should match up pretty well... So if you are going to flow to a curvy target, the originating curve should be the same length. FYI.