I'm working on overhauling the weapons system* for medieval/fantasy, and have run into a snag with halberds. The hook on the back of the halberd wasn't a pick for finishing incapacitated foes as I had originally thought. Pollaxes normally have those. No, the hook was primarily used to drag mounted combatants off their horses, and secondarily to trip and hook the limbs and weapons of those on foot. I'd like to model those effects as well, but I'm not sure how to go about that. Have any of you done this? Are there books that cover this? What would you suggest??
*adding a penetration mechanic, adjusting damage values, making prices at least somewhat historic, making weapons have different modes depending on how it's used (hammers, axes, picks having different values depending on which head you want to use, halfswording/thrusting with swords, etc.). Might end up being more complex, but mostly on the bookkeeping end and not the dice-rolling end, which I don't mind if adds to realism/flavor/fun.