Hi Pilou.

@You : "...The store's case is like a "Copy" inside the ClipBoard ?..."

This is a surprise !
No...in all seriousness, I have already planned to write a brand new plugin : "SelectionMaster " !!

"SelectionMaster" will be a very useful tool. You will see....

@You : "...Selection(s) given by the slider can be Copied, Moved, Erased ?..."

I'm sorry but I didn't understand this question :)

The main purpose of "FilterCurvesByLength" is to give the ability to SELECT curves and edges based on their length.
All it does is to produce a selection of objects.
What you do later with that selected curves/edges is up to you.

Anyway, I'v already planned to add the chance to export the filtering information to a txt file :
"Shortest, longest, amount of filtered curves, etc..."

Stay tuned!

Ciao.

Marco (mkdm)