Regarding mounts, I somewhat disagree. It makes sense for combat speed to be increased by being mounted if you're charging, and are using a melee weapon. The game simply does not make those distinctions yet, leading to a bit of silliness. A charge should be an ability granted by mounts, I feel. This could be combined with some variant of the sprint ability as well, or perhaps not. Depends on how balance looks, maybe.
None of the other ideas are relevant to my own interests, though they seem like reasonable ideas to me.