While looking in Preferences for something else I noticed a promising option.
From pg. 1085 of the OPs Manual
If you activate Enharmonics from Chord Track, and your project contains
a chord track with chord events, these chord events determine if the
enharmonically equivalent notes in the Key Editor and in the List Editor are
displayed as sharp or flat.
Now all I want to know is where’s my pony.
OK it’s not quite fully baked yet. For example, if on the Chord Track you want to set the scale to Bb or Eb Major, they still are shown as A# or D# Major. But the notes in the Key Editor are correctly shown as flats. I guess if it has to still be wrong somewhere the scale name on the Chord Track is much better than notes in the Key Editor.
Start viewing at 6:38
Continue viewing to see some new enhancements to the Score Editor.
My sense is that this is a clear sign that the Cubase Score Editor will continue to receive attention even with the release of Dorico.
Flats were definitely needed for jazz! The Score Editor is one of the best implementations within a DAW; I hope it gets attention in every update since it is a big part of why I chose Cubase. Thanks Steinberg.
Slightly off topic, but when I got Cubase VST (1993), my first question on the oldf forum was “Where is the legato?” I was told there was none. I could not believe that either. Anyway there is a walk through on this in the latest Cubase hangout here: January 2016 Club Cubase Google Hangout - YouTube
warning: the sound quality is terrible