I presumed that would be the case given similar circular issues, so I kept the idea as mere pipe dream. However I still wonder if within the current framework the desired result could be easier to achieve or at least calculate. Two small improvements I can think of — 1: Being able to set the Minimum Indent as different units (Inches/CMs/MMs) 2: An additional option for indenting the right-side of the system as well (rather than adjusting the page margin as I’ve done)
I can’t think of anything to avoid the trial and error of figuring out your longest staff label length in spaces (or any other unit) until Dorico has a more robust measuring/ruler system to figure out the distance between the music frame and systemic barline.
EDIT: The circular issue only occurs if Dorico tried to resolve this automatically on a per page/system basis, right? It seems to me the exact process I indicated above, since it affects the entire layout, could be easily automated since Dorico should already know the length of the longest staff label and the distance in Engraving Options of the staff label from the systemic barline. Dorico could calculate that total, apply it as the Minimum Indent automatically, then if desired by the user apply this same indent to the right side (creating truly centered music), then layout and space all of the music. This operation would avoid any circular issues relating to spacing unless I am missing something?