Move element left/right (shift+arrow key) should work on all selected dynamics

Your idea

Would like (and indeed, expect) that if multiple elements (e.g. dynamics) are selected across multiple staves, that I can use shift+left or shift+right to move them all in parallel, rather than only the last selected one.
I'd also like to be able to use this feature if I've selected dynamics via the keyboard or "select similar" command etc. (AFAICT, currently it only works on the dynamic most recently clicked on with the mouse).

Problem to be solved

For dynamics in particular, when added to the end of a measure (after a dim. or cresc.) the default positioning is often not ideal, and in a large orchestral score you'll often have 6+ staves all with the same problem. Being able to select the dynamics for all of them and shift them left or right as needed at once would be a time saver (and, I'd say, what a user might reasonably expect to happen given you see they're all selected, and most other similar commands do operate on all selected items).

Prior art

No response

Additional context

In general I would think any command that can operate a single selected element could and should logically operate on all selected elements.

Checklist

• This request follows the guidelines for reporting issues
• I have verified that this feature request has not been logged before, by searching the issue tracker for similar requests