Well, I'd be down for a change in how cavalry work tbh. I think that, it would actually be kinda cool, though I must note that teamwork's rare enough as infantry--I fear that cavalry would just be unplayably nerfed for the individual horseman. Even with heavy armor and high HP, as an individual horseman "stalling out" near a group of enemies by some sort of polearm thrust is essentially a death sentence.
I think horses should be as just maneuverable as they are now when at a low speed, so that they can a) support infantry 1h/shield cav style and b) fight other cav up close and actually have fun.
I see this idea essentially creating two fighting situations for cavalry: the high speed, high impact, low maneuverability charge and the slow speed, highly maneuverable trot. Well, maybe the stat changes actually won't do anything to prompt this when implemented, but hell, it's what I'd like to see.
It'll force cavalry to stick with their respective team's infantry blob (for protection in the event of polearm rearing, and for distracting the enemy blob). It'll actually make the cavalry charge rewarding and effective, rather than stupid and suicidal. It'll probably make 1h/shield the preferred secondary weapon set of choice for cavalry, for they'll need that shit when fighting at slow speeds. The heavy lance would be heavily nerfed in its current role, and would essentially work as a tool for cavalry charges. The light and regular lances, being faster and more useful at a slow speed, up close, might begin to see more use.