It would be very handy and intuitive to be able to edit i.e. 1st/2nd ending lines by double-clicking and simply entering text. Usually you have to create custom line styles to create a "1.-x." and "on cue" ending. Same would apply to rit. or accel. lines. There is a bunch of neat presets for it, but with this simple text-entry trick, you could save a lot of time looking for the right preset!
Idea No. 260