Can you add the features of preventing untieing of leads, preventing horse mounting
and preventing opening horse inventories on horses inside a protect-animal field that you aren't allowed on?

also i haven't checked but snitch blocks should also log any animal leading or animal inventory events

I agree with all the above suggestions, but I think preventing mounting horses is already covered by the prevent-vehicle-enter flag but is just not not working correctly at this time. The flag's counterpart prevent-vehicle-exit works to stop people from dismounting horses though. Now that Bukkit has support for leads, I'm sure Phaed will get around so whipping up some miracle fix for our animals in time. :)

Oh, and if you were asking if Snitches currently log the lead and inventory events the answer is no. I have tried it. They do log horse deaths though but list them as "entity.horse".