Denton Liu [off-list ref] writes:

Currently, format-patch only accepts branch.<name>.description as a
branch-specific configuration variable. However, there are many other
options which would be useful to have on a branch-by-branch basis,
namely cover letter subject and To: and Cc: headers.

Teach format-patch to recognise these branch-specific configuration
options.

Note that this patchset[1] was created using these new configuration
options:

	[branch "submitted/fix-revisions-txt"]
		coverSubject = "cleanup revisions.txt"
		cc = "Andreas Heiduk [off-list ref]"
		cc = "Duy Nguyen [off-list ref]"
		cc = "Junio C Hamano [off-list ref]"

Do we have format.<something> configuration for these things?

What I am trying to get at is if these are better structured similar
to http options where http.<something> supplies the overall default
for <something>, while http.<destination>.<something> gives a more
destination site specific override of that default.  I.e. format.cc
is used as fallback, while format.<branch>.cc is used to override.

In any case, it smells to me that branch.<branch>.cc does not hint
strongly enough that they are meant to affect format-patch.