Just to throw in my 5c, I hate the chain follow system. Even if it would actually be smooth and easy to use, I would still hate the principles of it.

Classic BG controls are much better. Only selected characters move. Marquee select multiple characters. Most importantly a keybind for select all.

Add a follow toggle where unselected characters follow currently selected character(s) so we can still have this choice as well.

And add auto jump.