You are correct that I was using the "Update due dates/reassign
milestones" button on the dashboard. I'm aware of the date
shifting feature when doing an edit/quick edit in a milestone but
was suggesting a situation where there are 20 tasks under a
milestone but only 5 of them need to have their dates shifted based
on milestone date. If needed there could be a "select
all/un-select all" checkbox when choosing tasks.
Thanks for your reply,