Question regarding git fetch

[Tom Lambda <tom.lambda@gmail.com>]

I noticed that git-fetch seems smarter when it is run without a <refspec>
argument than when one specifies a branch name. I use a simple setup where a
remote central repository is defined when it is cloned the first time (clone
-o central ...). This leads to these default parameters:

remote.central.fetch=+refs/heads/*:refs/remotes/central/*
branch.master.remote=central
branch.master.merge=refs/heads/master

When I use "git fetch central" each branch in central's refs/heads/ is
automatically fetched to my refs/remotes/central/ as expected.

What was a little bit surprising to me is that running "git fetch central
master" does not update refs/remotes/central/master but simply updates
FETCH_HEAD.

I read the manual and I know that updating FETCH_HEAD is the expected
default behavior for git-fetch. However, I really like the fact that git
fetch (without <refspec>) knows that ANY branch in refs/heads/ corresponds
to refs/remotes/central/. Is there a way to change the configuration to have
"git fetch central branch" always updating refs/remotes/central/branch
whatever the specified branch.

I would prefer not to have to specify the <dst> each time:
git fetch central branch:remotes/central/branch

Thank you,
Tom

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