Mounted combat is new, cool, and not very useful. One of those doesn't belong, so to improve fighting from horseback, I've created a new perk tree.
These perks can be found in the Light Armor section of your menu, but none of them have any skill requirement and they are not connected to that tree. They are placed there because it's impossible to create a new tree.
This mod is highly compatible. The only game file changed was Light Armor's perk tree - everything else is new. It also works well with a variety of mounts and horse mods. I suggest combining it with http://skyrim.nexusmods.com/mods/14950.
