Add / Edit staves in existing part
Sometimes a part is nearly complete but a necessity for separate Ossia or cue note staff is realized after finalizing the part. Currently, fixing this requires making an entirely new part in order to contain the new staff. Unfortunately, this means all adjustments to the existing part are lost (text sizes, placement, system breaks, etc.). This can cause a great deal of extra work on large scores!
It would be fantastic if one could simply edit the staves contained within the part. That is: no longer grey out the selections in the Parts dialog after closing the window (as is noted in the similar idea to rename parts).