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I don't know what "facultative" means, but what you want is
optional option arguments.  Don't worry, I want that feature
too, and have even started implementing it on a branch of
the Optik source repository.  See
http://sourceforge.net/tracker/?func=detail&aid=1050431&group_id=38019&atid=421100
for a similar feature request.

I'm leaving this open, since I haven't finished anything or
merged it into the Python CVS.  It could be a few months
before there's any action here, and it certainly won't
happen before Optik 1.6 / Python 2.5.  Might require Optik
2.0, in which case I'm not certain when it'll get into Python.