Tip 1: Turn autorun on, press "apply" and restart the game(without restarting it may bug and not apply). Without autorun on, when you double tap and hold left side, it won't always sprint, only run. With autorun, it always sprints if you double tap and then hold. It's a bug. You always wanna sprint because of infinite stamina.

Tip 2: When you approach to mount Iguanodon, tap on the top left saddle icon, instead of the normal way on the right side. If you tap on the right, sometimes it may register as action and will make Iguanodon produce seeds instead of you mounting on the saddle. I would also recommend to disable the option that holding tap makes you dismount because some other tames have a hold action, like Trike charge, so you won't dismount while trying to do it.