I suggest to implement a kind of a copy that is linked to it's original segment and cannot be edited.
If you edit the original segment, you also change all copies.
It's like a repeat, but need not be in continuous bars.
In almost every music you repeat parts, e.g. in bass-lines, drums, refrain, chorus, D.C., DS. So if you change something in rosegarden, you have to hardcopy the changes to all other parts in the piece.
In finale this kind of copy is called a mirror. There you can even change single notes of a mirror for variations, transpose the mirror...