[Tyhm]

Dang straight...I could probably even make the ganis in about a minute. Might have to make 3 sets for the 3 different sizes...but then again, maybe not, maybe you could just fiddle with the playerZ so it's just sitting with the mount gani placed under the player. In that case you could do it all in exactly 1 gani, and pass in which gani the mount should be using; idle, walk, attack, hurt...
The scripting would be the hard part I suppose, particularly if they wanted the monster to cease to exist when captured then have the player effectively breathing slow-gas...but not so difficult if the player is effectively paused and their commands pass to controlling their ride...