Okay I can't go through every page, but as far as I went no one had mentioned a viable replacement for Sneak. I say disable sneak all together, and instead attach the same damage multipliers based off of how fast you are moving when you hit the target. Sounds more horse-like to me. Also, will people be able to ride on your back? I'm sure somebody had to ask that, but I ain't lookin'

If this creature works out then it would be as simple as following this tutorial to make a ridable centaur:
http://cs.elderscrolls.com/constwiki/index.php/Making_Ridable_Creatures
but riding the player Im pretty sure would be impossible.
what was ended up deciding for sneak, sneak mode consists of the player going sneak, but you cant move around in sneak mode (but still attack, cast spells etc). Same with backflips and whatnot from high acrobatics, ill be making them impossible.
Also I forgot to mention, you will be able to wear greaves and boots, they just wont be seeable, this is mainly to aviod having to patch for different items (knight of the Nine boots) and saves losing enchantment slots, same with full body armor (arena rainment) you can wear it but the bottom half will dissappear. All just for compatibility.