I see that staff labels are confined to music frames, and I want to support the request for allowing them to the left of the margin. For a piano duet in score form, I typically will have I and II to the left while still aligning the left bar line with the margin. I suppose I can add extra margin to the page templates and move any text over by that much, or add the labels as text after the music is laid out.
Let me know if I am missing an option that will achieve this without these work-arounds.