I know everyone loves Mr.Toad, but I get the impression that the powers that be don't really give a flying flip. I'm sure they figure that having one at DL would be enough.
JTTCOTE? Well, I don't really think it fits. BK is dedicated to mythical animals, not just general fantasy. I think it would be much more suited to Adventureland or Fantasyland, though it is fits best visually and thematically with DLP's Discoveryland (their TL), but that isn't an option. It's been a long time since I've read the story, but I seem to recall some type of creatures the characters encounter. Unless they were going to heavily emphasize them, it would seem totally out of place. I would find it interesting if they gave us a Jaws-type ride with the Loch Ness Monster/ random sea serpent.