General question first, are multi-instrument cues common in the wild?
Dorico question: I’ve got a spot where there’s an oboe/clarinet/viola chord as about the only thing that could be a cue for the solo violin, and I feel it would be more supportive as a chord, rather than one voice of it. Is there a way to do that?
Yes, as long as you don’t input a 2nd cue at the same position, you can move it into place by e.g. inputting it in the following bar and pressing Alt/Opt-left arrow until it’s back in the first bar. What I’ve then done before is edit one of the cue labels to be e.g. “Fl/Cl” and override the text for the 2nd without adding anything, so it doesn’t show a 2nd label.
You probably could get all 3 cues in, but that might end up with messy stem directions/rests. Alternatively you could add a dummy staff that doesn’t appear in the score with a manually condensed chord and cue that.