MusicVillain:

You said:

"There are two major concerns with this 2023 new feature.

Concern #1 - Once you added a drum fill in this way, at a later time if you want to revert back to normal (no fill), you can't.

Concern #2 - It only adds drum fill to this bar, but not adding a crash cymbal at the first beat of the next bar. So, it's not adding the same type of drum fills as Part Markers do."

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Matt provided the solution to Concern #1.

For Concern #2, if you only need to add "add a crash cymbal at the first beat of the next bar",
can you not use the BIAB 2023 feature of "Playable Real Drums", and add the crash cymbal where you need it?

I haven't tried it but it would seem to me to be a viable option.
Good luck!
LLOYD S