With the recent update, we have been able to put the cargo inside of a wagon without having to press the "Open" button. However, it has a huge disadvantage - you cannot see where exactly you're putting the log of wood/chest. Consequently, you have to unload the wagon completely, sort out everything outside, and only then you'd have to load it. You cannot look for a specific chest anymore. Example:
I have large chests with linen cloths and leather. I visually divide them inside of the wagon's inventory by placing them on certain rows. When I'll reach my destination, I'll be able to easily find the needed chests and unload them. Nowadays, I cannot do that and it makes my life a hell.
What I would like to suggest is to:
Lift the container/object and press Shift+click on the wagon to place the object immediately without opening the inventory window. However, if you wouldn't press it, you would open the inventory window.
I also think that instead of using Ride option we should be able to Ctrl+click on the wagon to get on it. Same for horses.