Pack trains (animals)

I have been taking llamas in a caravan a lot lately, and I have noticed a few things. 1. The llamas will become disoriented and confused when brought over water in a caravan, and it is a pain to round them up again. 2. The llamas sometimes just wander off, even though I am just walking straight on flat ground. So, I believe that Minecraft should add the choice to use a pack train. (Using a lead, roping the animals together) when a pack train is made, the llamas will not be able to wander off in random directions. It will also be much easier to get them from point a to point b. You don’t need any new materials, just a lead and the option to rope the animals together.