Break-Listing on D/M rather than full Datetime

Currently report.myreport.sort=due+/ gives listing breaks on datetimes that have any differences at all.
I had hoped report.myreport.sort=due.day+/ or similar approaches would give a more useful listing (eg per day).

Since only tasks due at the _exact same datetime_ are grouped together and all other are broken up the resulting format is basically having blocks of tasks that were created to be due the same day but without due time (and thus have 00:00:00) and pretty much every other task.

If it's not feasible to give options for break-listing the result of due+-/ should be breaks on day or week