option directive to fast-import

Heya,

What would you think of a 'option' directive to fast-import?

'option' SP <option> SP <value> LF

Where <option> is:

import-marks export-marks force_update quiet stats date-format depth active-branches export-pack-edges

I just checked them all, and as far as I can see, as long as the option directives come before any data, there should be no negative side-effects to setting these values 'late'. The upside would be that the frontend can tell git fast-import it's preferences, so that the user does not have to type a humongous commandline, but instead can suffice to just go with 'foo fast-export | git fast-import'. Of course, the user might want to override these options manually, so the option directives should only be honored if no commandline flag is given.

Would you accept such a patch? If yes, I'll whip something up :).