Users have asked for this multiple times since last release.
Not sure on the best default value, but I'm going with the
stable/classic one, at least for the initial release to avoid needing
migrations.
In the future we may reconsider this for new users.
This was another IRL request from a mapper / team member. The rationale
here is that it can be very annoying to map with break time enabled if
you have a large gap in the beatmap you are trying to fill with
hitobjects, as you are placing objects on top of a very gray area.