AFAIK, you can add suppression at the Assembly level, although I did not use it in anger! If you do this, you will have false negatives. (i.e. suppress all incidents that violate this rule).
[SuppressMessage ("Microsoft.Design", "CA1704", Scope = "Assembly")]
I think the user dictionary in the source control is the best option, otherwise you can save the FxCop project in the source control.
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