It’s one of my most used features, and it applies to everything you can select. You can duplicate a whole line down for example, and then with the lock rhythm feature (pressing L while in Note Input) quickly respell it to get a homophone structure.
( Beware, though. If the playing technique is added at the start of a tuplet, duplicating it like this will lead to the tuplet being duplicated with the playing technique. It’s a known limitation).
And hi 
! 