This patch was released on/in:

 2012-05-15: 1.4.20

to documenting patches to the templates is still an open issue.

I claim the ticket number in the CHANGES.txt file is sufficient
to find the ticket that should have a patch attached or a reference to
the hg checkin that fixed the issue.

The user can pull the diff from there.

I don't think supplying a diff for every release really scales.

Is there a simple set of directions that will allow the end user/admin
to generate a diff on their own that they can try to apply?