About the ox system;
To get the ox to the next map, you have to place it on the transition without going through it yourself, or at least that's how I make it work when it acts up. Go onto the transition (don't go through), make the ox follow onto the blue space, then go through.
However, some transitions like the Vallaki gates (both north gates and the west gate) have smaller, thinner transitions which makes it incredibly hard to make the ox pass through if you don't get lucky with the AI or know how to get them onto the blue area.
Can these transitions be made a little bit thicker I suppose? If it doesn't ruin anything else around them.