(silly answer) Because there are no rules for it in published HW.
(better answer) Simply add a modifier ('knack for wind words', 'clumsy with a greatsword').
(another answer) I'm not against additive abilities (i.e. upgradeable modifiers). If you wan't to be better a certain feats or actions, you can have the ability 'wind words' or 'knows his way around a kitchen' with a +2 rating, which is increased as any other ability (i.e. 1 or 2 HPs).
-- - Mikael Raaterova [.sig omitted on legal advice]
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