In the attachement a UI-Script that`s make a Transform Spline with a paramter of 5.

Maybe someone need it, or take it as learning how to UI-script (myself for example).

I use the "Split area with Line"-Script (don`t know who is made it, but many thanks to this one)

and change the Operator.

The second attachement is the Original Script (it works with lines, too. Not only with areas like the name make the appearance)

Attachments:
Spline_5.txt
split areas with lines.txt