Regarding mounts with carts: I was planning to have separate larger carts that mounts can pull. That would be in a second patch. Before those are ready I have two options.

1) Allow your regular cart to be attached and pulled by the mount. For this, I've already adjusted the code to position the cart better and will patch this change with the next update on the Test Server.

2) Block carts while mounted for now, until I can set up the larger carts.

Most likely I will go with number one as that's more convenient for players.

I'll post again after I make a few changes and improvements.