scary as it may sound, i'm going to order this as most requested to least...

1. animal lore - 3 (skill related)
2. Horse's ability to reach hunting grounds - 2 (travel related)
3. Group mechanics - 2 (travel related)
(the rest all had 1 suggestion)
4. face mechanics (hunting related)
5. bond mechanics ( horse specific)
6. manure (horse specific) - made me laugh
7. horse satchels to carry items (horse specific)
8. saw a mention of a bucking horse (something else to do with horses instead of jousting, like bull riding)
9. bonus to melee combat, but i would imagine a degrade in defences since your not on your feet.

Again, these are the results of like 12 people (some wanted more then 1) perhaps I should have opened it up to the top 3 requests one would like to see and then actively fight for some gm to actually work on them. Become like a horse spokeman.

(tried to be a GM, but I apparently can't devote enough time per week to be it)