Would it be possible to add a option to split one polyline into two sections.
you can already do that. Rt. Click on the line and select Split.
I believe that they only applied the split function to PolyLength, Looking for it to be added to Polyline.
@mbrennan I was going to say the same as @Doug McLean, but you are correct with Polylines the split functionality isn't available.
This is one of a few reasons that I do my best to make all of my markups as measurements - I manage what, if anything, is displayed caption wise. There is of course the added step of having to set a scale on a document that otherwise would not need it, but it provides significantly more flexibility.
Hope this helps. 😎