My habit with beam groups with 16ths and smaller is to have the beam group extend over rests unless the group begins or ends with a rest. So with four sixteenths in one beat, for rest-note-rest-note, I’d have the last three 16ths beamed, and a stemlet down to the second rest. For note-rest-note-rest, the first three 16ths would be beamed, and a stemlet down to the first rest. And I don’t do this for groups of eighths, just 16ths and smaller.
With Dorico, unless I’m missing something, stemlets are possible only if the whole beat is beamed. And stemlets force full-beat beaming for 8ths also.
In Finale, I achieve this in the Document options, checking “Extend secondary beams over rests” and “Display half-stems for beamed rests,” and not checking “Extend beams over rests.” I also check “allow rests to float.”
In Finale, the stemlets are consistently one size. In Dorico, the stemlets can be VERY long. And once stemlets are used, no longer have full control over the beam within that beat group.
I think my way of doing things is not unusual. The closest I can get with Dorico is to keep stemlets off – but I want the stemlets, and I want them of a consistent length (because the rests float), and I want them NOT to force the beam to cover an initiating or terminal rest in a beam group.