Remove cast time from Mounting, like you are from Summoning

[Rongway]

The point is to not have a specific keybind for it and reduce the number of keys you have to press.

Approaching a mob you want to attack and you're mounted? Just press whatever ability you want to start with and poof it unmounts you and cast it.

It has a specific keybind as a matter of safety. You can't re-mount once you're in combat. The dismount key protects you from activating an instant action against a mob unintentionally, forcing you to the ground, and preventing you from mounting again.