So now that I've run around with the mounts I find there's one problem that makes them not as fluid as they should be. The multi-select for mounts is clunky and many times just trying to hit the small cycle edge is not compatible with rushed action. So here's three seperate suggestions that could help with this problem.
1: Put the mounts by type above the buffs on the skill bar, since this section of the bar is not used for actions it would be a good place to set five icons.
2: Put a small grid at the end of the skillbar instead of the single button icon again by mount.
3: Allow right click to access menu on mount icon.
First two could in theory allow you to change mounts without the added dismount before selecting the new mount which would allow a bit more seamless interaction.