When one is doing a medley of multiple pieces it would be very useful to have two sets of measure numbers (primary and secondary?). One set (primary) is the consecutive set that runs beginning to end of the medley. The other (secondary and printed in parentheses or brackets) is a set that starts over (from 1 or whatever the arranger indicates) with each piece, segment, or portion included in the larger work so that it matches the measure numbering in the original material.
By default secondary numbering would be unselected and not printed, but it can be selected with a checkbox to include it. Also by default secondary numbering would match primary numbering at the start, but it need not do so. A further nicety would be to be able to turn secondary numbering on or off at any measure of the piece. For example, it is not necessary to print it where it matches the primary numbering.
I realize that this may involve extending the MusicXML schema if the secondary numbering is to be exportable. I hope that's not too much to ask.