Taking this a step further, what would be really nice is if there were several kinds of mounts, each one only being able to access a certain area. For example, what about sea mounts being able to swim over water and even dive into it\'s depths. Of course, diving would be a bad idea to someone whose race isn\'t made to survive under water for long.
These mounts could be tamable, which might even open up a whole new job area, that being beast tamers... possibly even summoners if their magic skills are high. Different races would naturally have varing luck with taming certain beasts as well. Humans would be somewhere in the middle in this, animalistic races having the best luck taming, while the more bulky arcane ones having next to zilch luck.
Alignment could play a part in this too, good being able to tame innocent and pure creatures, evil taming the dark and powerful, while neutral could go either way, but wouldn\'t be able to tame the excessively good or evil aligned creatures.
It could even be taken further with the introduction of taming items, feed, and mount exclusive equipment, but that might be overkill...