Lead sheet centric requests

I use Notion mostly for making lead sheets for jazz groups so everything here is related to that.

1. Turn off clef, key signature, and time signature after the first bar with barlines at the start of the staff on preceding systems
2. Option for courtesy accidentals at the start of a measure
3. Ability to make more than 2 endings. This one is especially important for jazz charts.
4. Ability to reposition all of the chord symbols at once. Notion's default height for chord symbols is way too high.
5. Sub- and super-script font options for chord symbols. i.e. C7(#9) could display as C7^(#9). Minor issue, but would be nice.
6. Accidental support for headers.
7. Ability to select multiple measures and click "Fit to system"
8. Ability to apply measure linking, force new system, force new page options to every part at once.

Great program otherwise. I've been recommending it to people for the last year or two and they've all been (mostly) happy with it.