I would love to see an option to split a polyline on a selected vertex, without creating the 2 new lines in a different output database (fgdb, sde or whatever).
The tool "Split into COGO lines" does something similar but creats new line segments between all vertices, instead of just the one I need to split between. The tool "Split" requires you to draw a line over the polyline, and is therfore not that precise.
We are splitting water distribution lines on certain points in our Utility Network and this would be of great help for our drawing room.