To my mind, something like finesse could be covered by having a higher skill, thus increasing the chance for a critical hit, or, as you've noted, an Impale result.
However, this does note something interesting about the BRP rules. Combat is fairly simple, but it doesn't represent different types of combat. Swashbuckling musketeer types uses the same rules as a axe-wielding Barbarian. This might prove to be fruitful ground for further supplements.
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