Multi-cursor input

Your idea

Allow multipel input cursors or the input cursor to spans multiple staves.

Problem to be solved

This allows you to input notes and notations onto multiple staves simultaneously

Prior art

Popular code editors have a similar feature:
VsCode: https://code.visualstudio.com/docs/editing/codebasics#_multiple-selections-multicursor
Neovim: https://github.com/jake-stewart/multicursor.nvim
Zed: https://zed.dev/features#multi-cursor-editing

Dorico allows to extend the caret to multiple staves:
https://www.steinberg.help/r/dorico-pro/5.0/en/dorico/topics/write_mode/write_mode_note_input/write_mode_caret_extending_other_staves_t.htm

This is an example mentioned in the Dorico forums:
https://forums.steinberg.net/t/ot-today-one-year-ago-finale-has-been-put-into-coma/1006675/16

Additional context

No response

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

Start by reviewing the issue description and its linked examples from VS Code, Neovim, Zed, and Dorico to clarify the intended multi-cursor behavior. Done should allow notes and notations to be entered simultaneously across multiple staves, but the issue names no MuseScore files, tests, or entry points.