Totally agree but I want just unrotate/ rotate some curves of the "after sweep" (not all)
so your script help me to choose in the top view with only curves without surfaces!

It's for that i had need "start / end" for easily see what are the curves flipped
your script is now sufficient
because make: go 3D go 2D views is some painful
In the 2D view I can see now "start / end" for choose any that I want flip or not ;)