I'm currently working on the functionality mentioned in issue #289. This feature would allow a user to select, say a Trumpet or Horn, and choose its key rather than having 8+ keys listed in the instrument name list. I currently have made a skeleton for this feature in brass.py and _base.py in scorewiz/parts (Which you can access below; I didn't want to commit this as it currently is broken).

I've created a new class in _base.py called "InstrumentKey" that allows a user to select the key of the instrument. Currently, only Horn has available keys. All the feature does is allow the user to choose the key. I have no idea where to go with scripting this. I have a lot of free time this week, so if someone could give me a pointer, I could finish this functionality by the weekend. I am still relatively new to Python, so any help would be great!

Add these to frescobaldi_app/scorewiz/parts/ (and back up your originals, of course! :) )
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brass.py: http://pastebin.com/tK4t4hFw
_base.py: http://pastebin.com/4JKg6XKN