Brass without key sig - default preference

Is there a way to select a preference (particularly for music imported via XML) so that Trumpets and Horns can automatically choose the “transposed without key signature” option? If not, could this be added somewhere to the roadmap?

(I know I can go through and change these individually, but when consolidating a musical score from separate XML files, this is a lot of separate changes.)

No, there’s no way to do this, I’m afraid. Probably we need to improve Dorico’s MusicXML import to figure out whether a key signature is shown for these brass instruments and choose the “no key signature” version automatically.