Save-as feature in "now playing"

[John]

It would be great if "now playing" could be saved as a playlist.

Typical scenario: you quickly build a playlist from a bunch of directories to get something that's roughly acceptable as a playlist, but needs further editing. As you play the list, you delete from "now playing" the songs that don't belong in the list; last, you save the changes back to the list. Only this last action requires a new feature.

Without this feature, you would have to (1) save whatever's in the playlist builder, (2)  replace it by the list you are listening to, (3) sort to locate the song to delete, (4) scroll to it, (5) delete it, and  (6) save the updated list.
With it, there's no search needed because the "now playing" list is already at the right position.