Custom key signature - if there are different accidentals in different octaves, they are not aplied to score
If there are different accidentals in different octaves, only one affects all octaves.
This kind of key signatures are ofen used in scordatura scores.
This kind of key signatures:
is in score interpreted like this:
but it should be:
The way would be have option to "per octave only accidental".
Or less flexible, but still usable, if there are more accidentals, than one, set it "per octave".