Quadrivium

Note copying function. Duplication of like sounds over different rhythms.

Hybrid time signatures_ during a swift browse over the forum the idea for a hybrid key signature was also exposed. Might be useful. But time is mandatory.
and lastly,

Quick key to silence notes (for when slurs are in effect) ..if that makes sense. It can be done manually. It's just inconvenient if playback being made use of.