Segment Editing: Splitting

If you select a point in a Point Pane, the right click "Split Segment(s)..." context menu will divide a single track segment at the selected point.

Multiple points can be selected to create segments at each of the selected points.

Segment Editing: Merging

Multiple segments within a track can be merged into a single segment by selected them in a Point Pane and using the "Merge Segments" context menu.