Easier to give an example, probably…
- Create some notes, with some random gradual dynamics.
- Select the music (say, we’re talking two bars, so just select everthing in the two bars)
- Right Click, Dynamics > Group Dynamics
- It does nothing.
- Right click, Filter > All Dynamics
- It actually does what you want.
Why are steps 4-6 nessesary?
I haven’t done extensive testing, but I bet there are a lot of other parallel situations.
Essentially what I propose is that commands that operate on a single type of object should just ignore any part of the selection that it doesn’t apply to rather than refusing to do anything.