Only just discovered, if you have multiple characters in the same location and use 1-4 to switch between, you can move multiple at the same time. This could save a fair amount of time, especially with the factory, where I've previously been moving each character over to the door one at a time - you can move all four over in the same time as it takes to move one!

Yeah i have done this a few times, it seems faster to switch between them, would be nice to see a time comparison if anyone wants to do it?

it's tough but with some practice its gonna save a lot of time. a sloppy multi walk at factory already saves a considerable amount of time.