Add syntax for "first page only" and "except on first page" to Header, Footer, Numbers options
S5 - Suggestion
This would be a very simple solution to the problem of entering a multi-line copyright on the first page of a score (simple to implement, that is—not necessarily any simpler for the user to figure out, but still needed in the current system).
Using $C in Header/Footer/Numbers plus using copy/past a multiline text to File→Info...→copyright does the trick, but indeed for copyright only
FWIW, an totally different way of achieving this would be to divorce this from the notion of a footer and have a new "page-attached text frame". This request occasionally comes up in other contexts where, I think, it doesn't really make sense as the text relly is attached to a specific measure not to a specific page. But it *would* solve this problem. It could even replace the footer mechanism, if we added properties to this frame to specify which page(s) it appears on. Pretty sure I've seen headers & footers implemented that way elsewhere, but not sure. Hmm, Finale maybe?
The addition to the title comes from https://musescore.org/en/node/76476#comment-350736. There are a few special cases already—note $p and $C—but in general it's not possible to do this for regular header or footer text.
EDIT: Actually, the default for https://musescore.org/en/node/76476#comment-350736 is another of those special cases.
Rather than adding score-wide options related to single score points, I suspect that this point, as well as a number of other specific requests, could be addressed by implementing some page-specific format/layout options.
The programme already has the concept of page, as a class, and already saves pages to the score file. As far as I can tell, pages are always 0-property elements, though. By adding properties to a single page, it would be possible to solve this kind of details.
Properties could be specific header / footer contents (including no contents at all for totally blank pages), different margins, and so on. Options could also be implemented over time, when the need arises. By default, pages would use score-wide settings, unless individually overridden.