pull.rebase config vs. --ff-only on command line

Hi,

this is my first time contacting you guys and girls so I hope this mail 
achieves the expected standard. I've discovered the following behaviour 
of git:

If pull.rebase is configured to true and git pull --ff-only is executed 
it seems like the config wins, i.e. issuing "Successfully rebased and 
updated refs/heads/...", which is not what I would expect. I always 
believed that command line options would overwrite configured options.

Is my assumption that command line options always win wrong or is this a 
bug?

Best regards,
Matthias

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