True, I have to adjust the dot. But I assume that no automatism is provided for my solution? Thirds can be aligned vertically without colliding heads or stems. The problems are the dots, which cannot be moved vertically.
Or do you think my version is non-standard?
Your alignment is decidedly non-standard. You can adjust the default gaps Dorico uses for interlocking voices in the Voices section of the Notes page of Engraving Options, but you won’t be able to persuade Dorico to completely align notes in opposing voices that are only a third apart as if they are in the same column, because it’s really quite unclear.
You are right, I looked it up in Gould; however Dorico’s standard does not satisfy me. After all John Ruggero’s solution (measure “3”) would be my choice and congruent with Gould, but how can the dot be moved upwards? I think Dorico does not offer this, which I deeply regret.
We have no control over this. It is a FR that the team is aware of though (I started a thread about it at least 3 years ago.) The only way to manipulate this is by changing stem direction, or adding additional notes that cases the algorithm to change the dot placement automatically, and then hiding them in the alpha channel or scaling them to 1%.