This suggestion (accepted solution) is what we are already doing. My hope in posting the question was to get some more clear guidance on how to better leverage the feature to benefit. (There is one dedicate Canvas Guide... but, it only provides ideal behavior.)
FWIW, I did a very controlled test, and I could not get the "adjust dates" feature to act properly.
- Two course shells.
- Each, five days long.
- First course had four assignments.
- Each assignment due on the first, second, third and fourth day of the five-day class, respectively.
- Imported the contents of first course shell into the second course shell.
The resulting due dates in the second course shell were either (depending on variables chosen)... a) the very same due dates that they were in the first course shell, or b) different dates, but out of sequence, and extending beyond the last day of class.
So, if the feature doesn't work in the most controlled of circumstances... and, the "accepted solution" is to ignore it and enter due dates manually... then, I ask the feature be removed. That will save future Canvas users (and support staff) thinking about the feature or trying to make it work.