I believe that mounts should still stick to bieng Chocobo only. I have never seen anything mounted in any FF games other than the occasional car or motorcycle. Just because you have Chocobo's, does not mean that a design team has to be boring and just make the same yellow chocobo. Try making Chocobo's of all different shapes and sizes, Chocobo's with different colored and designed saddles. I think that would be amazing. Just because you are dealing with one animal, does not mean that you have to make it look like the same boring design of all other Chocobo's in other FF games.