Default email digest frequency

I’d love “every 3 days” to make a comeback because it seems to be the sweet spot for our private forums.
(was changed here: Bigger intervals/ lower frequency for activity summary?):

We want this so much that we over-ride the setting and have an ugly “4320” minutes showing on people’s email settings.

Also, it would be nice to be able to turn off the automatic suppression of the summary email that happens when users receive any email from the instance, as per:

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