Different languages for instrument names without changing interface language
I'm American, but I'd really prefer German or Italian names for instruments. Posaune is much easier to pick out of a score than Trombone, and seeing the word Violoncellos just makes me twitch a bit. Italian word, English pluralization, yikes.
It's like dynamic markings. I could just write louder, and 90 percent of the world would understand, but I prefer to write piu forte.