The order if the playlists can be changed by changing the Rank in Edit Mode. After a while you will have numbers which are sequential and wont allow you to add items in between. The Reorder popup menu item provides a renumbering function to increment all items in the Playlist or Titles grids. the numbering will be in increments of 10.
By selecting the right mouse click you, select the popup menu.
By dropping and dragging the playlist items or Titles into a sequence. StageDirector will automatically Reorder the Rank