Hello, I know the shortcuts for “Respell Using Note Name Above” and “Respell Using Note Name Below”.
Is there a possibility to just toggle the accidental with one key?
No, there isn’t, because the feature in Dorico doesn’t work the way it does in your other scoring software: it works in a better and more sophisticated way.
Thank you Daniel, that is probably, why I can’t follow… 
The main advantages of Dorico’s system are two-fold: firstly, you can normally get to the accidental you want in only one step; and secondly, when you respell a whole chord, it can make a smarter decision about how to respell the whole chord.
thank you, that makes perfectly sense.