This is a very old bug I reproduced as far back as 21.03 that will not be addressed in this release.
Action list some kind of drop down menu that would add filter options
Since the Action list allows the user to change shortcut keys, there should be an equivalent of a preset option like there is on filters.
These are out-of-scope for this release.
I am no longer going to respond to everything new raised in this thread. People can leave feedback, which I may take into consideration.
That was never a deliberate feature, and it went away over a year ago in version 21.05. Rather, it is a subtle behavior, and these things do change as the software still heavily improves. Besides, there is a better way to do this press O (letter ‘o’ for “out”, not zero) instead of S.
This is in the new Help > Actions and Shortcuts, and it is known as trimming on the timeline. So, obviously that is I for “in.” And do not forget the ripple versions of these that do as X did: Shift+O and Shift+I. And by the way, these are not new but in the new version more explicit (can be seen in the timeline menu too).