I’m not convinced of the bisbigliando techniques included as standard.
As far as I know, bisbigliando should be a playing technique where you trill between different fingerings. It should be a trill of timbres.
I see it is associated, in Dorico, to a playback playing technique that is called ‘Whisper’. While this is the correct translation of the original Italian word, I don’t think it is the correct one for this technique.
Or, maybe I’m simply confused by not being a native English speaker.