Copy Rehearsal marks and tempo changes to another staff (duplicating them for rehearsal/piano reduction score)

BTW I'm just looking through some of my orchestral scores and interestingly:
a) Virtually all of them have all tempo markings repeated above the string section. This is true even on reduced systems where there's only a single other staff above them!
b) Rehearsal marks are sometimes repeated above the string section, sometimes not. In some scores they're repeated below the bottom staff. I'm not convinced treating rehearsal marks differently to tempo markings significantly improves score readability.
c) Very rarely a particular system marking is NOT repeated above the (full) string section, but in the cases I found I couldn't see any good reason this should be so, and may have simply been an oversight by the typesetter. In one case the tempo marking was moved above the harp part, even though just two pages before tempo markings had been below the harp part (above the strings). Again, I can't see any good reason for this nor would I imagine a conductor would choose to work off a score with tempo markings that don't appear at consistent placings in the score.
d) It's not uncommon for an extra staff such as "solo violin" to appear above the standard string staves, and in such cases, the tempo marking moves above that. Which leads to an interesting idea - that whether to show the system markings could be a property of a bracket? If not, then there'd really need to be a way to add an instrument staff like this that's mostly hidden but still allows the tempo marking to appear as expected.
e) If the violin I part is hidden in the string section, the tempo/rehearsal mark may or may not be shown. An example is page 83 of the B&H Rite of Spring score, which has a very condensed system with only Cl/Horn/Cello/Db - and only a single tempo/rehearsal mark above the whole system. But on page 112, the rehearsal mark [132] is in fact repeated above the reduced string section (Cello+Db only). Similarly on page 120.
f) if the whole string section is hidden, markings normally shown above it are not shown at all. Obviously if they're shown below the score they should be in this case too (unless perhaps there's only a single visible staff for the whole system).
f) Very few scores showed tempo or rehearsal markings in more than two places, however my UE Mahler 8 study score has tempo markings above Chorus and Strings (and rehearsal markings only at the very top and very bottom of the score), though not entirely consistently (e.g. very first bar has the tempo only at the very top, and later in the piece, e.g. from rehearsal mark 73, it also shows tempo markings above the brass section instead of the choir, sometimes alternating on a page-by-page basis, then at rehearsal mark 106 the tempo markings are shown in 4 locations - at top, above brass, above pianos/harps (but below harmonium), and above strings. Frankly I don't think MuseScore should make this easy to do, I can't imagine the full conductor's score is laid out like this.
OTOH my OUP study score for Sinfonia Antartica does quite consistently have tempo and rehearsal markings shown above 4 staves through the score, with one or two condensed systems where it wouldn't be sensible to do so.

On that basis I'd say...

a) critical: the ability to specify that system elements (tempo/rehearsal marks etc.) by default should be shown above at least one other staff, consistently throughout the score. Minimal expectation is that for systems where this staff is hidden, it's shown above first visible staff below it, if any. The default orchestral templates should have this configured for the 1st violin line.
b) better: as above, but the ability to override this for particular system elements, e.g. for particularly condensed systems where for space reasons it's more sensible to only show it at the very top.
c) even better: the ability to specify that, e.g. tempo markings are to be shown above at least one other staff (or below the whole system), and a separate similar configuration for rehearsal marks.
d) ultimate solution, the ability to specify multiple staves where such elements should appear above/below, and the ability to override on a per-marking basis (it's sufficient to be able to just hide a particular marking over a particular staff)

BTW I don't believe this a difficult feature to implement - the hard part (collision avoidance etc.) has already been implemented, and the UI need not be particularly complex (it could almost be just a checkbox property of a staff). But it would save a lot of messing around trying to replicate the appearance of such markings using staff text elements etc.