It's already there. Ctrl+Shift+tilde.

Note that I also asked several years ago to have the Rest checkbox 'stick'. The Help menu under Notation Menu,
Notation Mode implies it does, but it does not:

Note Insert mode
Toggling this allows you to insert either notes or rests graphically with your mouse or keyboard on the notation window.



BIAB 2026 Win Audiophile. Software: Fender Studio One 8, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Fender Quantom HD8 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.