When it comes to Horses Automatically Sprint is such a needed skill I highly recommend making it obtainable at Trainer Apprentice 1 to lower the barrier of entry.

That being said I would add:

Skilled Trainer unlocks: Forest Rush

Artisan Trainer unlocks: Automatically Sprint + Instant Accel

Master Trainer unlocks: Automatically Sprint + Instant Accel + S-Instant Accel

In a game that encourages so many alts I just think the slow grind to get to Artisan is too much to unlock such a basic & needed skill for all players. I say that as a Master 3 Trainer. I don't want to do training again & again & again to just unlock sprint. Please consider my re-work.

Now our horses can dive head-first into the water and get stuck in obstacles much faster!

Sounds good, but I doubt it would work unless the auto-pathing is somewhat fixed.. I hardly auto-sprint cause I always miss bridges or get stuck in one of the hundreds of ambient props in calpheon city, etc.

The auto-sprinting itself needs to be reworked (as does auto breezy-sail). Lowering the barrier to entry would be nice, but the feature has been implemented badly enough that a lot of players simply avoid using it. The horse actually needs to stick to the auto-path and not get stuck. Auto breezy-sail isn't quite as bad, since your boat is less likely to have something to get stuck on, but it still happens quite frequently (especially since auto-pathing for boats loves to go near islands instead of avoiding them for some dumb reason), and you also often end up with your boat going in circles because of how the auto-pathing goes stupid when breezy-sail kicks in. Auto sprint and auto breezy-sail are nice ideas, but the implementation needs work.