I'd love the idea of a /hide mount, and appeance slot for mounts. My illy looks good on a carpet, as it matches the caster character, but is so flipping slow compared to all the new mounts and gives no buffs...same with the rhinos or those godawful spellbears. Want the buffs, don't want the mount look.
And on my swashy on Venekor, as a scout it's in my best interest to be as small and subtle as possible so I can sneak up on my victims before going all stabbystab...impossible when a rhino or horse is hoisting me 5 feet in the air and doubles me in size.