I haven played Pathfinder but i think that the best way to move a party is to select who you want to move and others will stay where they are. If you select all everybody moves together with the AI pathing trying to avoid to have them step on fire, if you select just the sneaking rogue to give a peek behind the corner, others stay there, waiting for the rogue to position before moving to attack.

About six members party dunno, mixed blessing; would have been mandatory to have two fighters in the frontline with old DnD rules but now Rogues can hold the line easily, at least at low level, and even mages arent brittle as they were before