Found a really useful tip, so sharing it here, i hope it is useful:
When I was leveling my multi-boxing, I used macro that went /tar x, focus target of x, cast focus target y (wrath, smite, lightning bolt) which I tied up with 1and 2 was action button (i.e right click) with auto-loot on and I bound backward moves to 3 and the stop button is not available as per my knowledge. I'd fix my laptop's camera, spam a macro on my primary char on PC concentrated mouse over cast z and just quest using 1-3 buttons. I also had healed macros set to 4 and 5, but now after-wards I just have one of my chars set to follow and make my first pass on loot once they have all the quest items.