Right and there's lots of pokey polearms, and any of them would be great for additional spear designs in game. The problem is when you start getting into polarms they are often very specialized in how the head is built and it's function. You'd practically need a whole new style for each one.
Not really, at least not in the sense that any of the present classes of weapons differ in function between various items represented (e.g. falchion vs. arming sword). Most weapons by medieval times had a point and a functional edge of some sort -- hook (e.g. guisarme), axe head (bardiche), blade (glaive), hammer (Lucerne hammer), or a combination (pollaxe, bec de corbin, halberd, etc). By recognizing these two elements, you can represent a wide variety of polearm styles ingame with one animation set. It may not be perfect, but it ain't half bad.