cut (and paste?) voice on selection.
Very often arrangers, composers, and orchestrators, write voices on the score that later they(we) will have to separate in order to do the respective parts (winds, horns, etc). So a cut (x) voice for a selection would be a very handy tool. (see that I am not proposing a "voice to part" function cause it can get quite messy since some parts written for voice 1 or any other voice alone could be written for all or just for one part and museScore doesn´t have to know that)
Plus If we could copy a selection and then paste voice ___ to voice __ on another staff/measure it would be very much appreciated also.