My favourite niche factoid (today, at least) about Sibelius (music software, not composer) is that you can create a notehead style that is both headless and stemless. Which leaves… nothing*.
And I make use of this a lot for some composers, mostly where aleatoric things are happening, to fill bars where something unnotated is happening, which avoids multirests appearing in the part.
* okay, not nothing in all cases: if you put an accidental on it, that will show, as well as any articulations.
