voice narrowing possible between 2 voices?

Is there a way to create a single notehead from the voices that share the same pitch but have a different rhythm?

This is what I would like to see:
Screen Shot 2017-09-20 at 16.43.04.png
And this is what I have now:
Screen Shot 2017-09-20 at 16.43.11.png

Of course! Dorico won’t do that automatically in this case because it minds the dot, but you can set the second voice’s notes to be in Voice Column 0 in Engraving Mode.

Change the default option in Notation Rules, Voices.

Great! Thanks so much. I would never have looked for in Engraving mode, this feels more like something that belongs in Write mode.

It’s in Setup Mode - and it is really nice to have this working in advance as opposed to invoking it after the fact via a plugin!

I’d counter the exact opposite. You’re concerned with how the notes are displaying on the page. Dorico accepted the correct semantics when you input the notes. You’re just tweaking how they display, not their actual value which is what write mode is for.