As I noticed, all the experienced players play without pause options during battle. I always play so far with the pause;in the game unit behaves as programmed robot, works without their own volition. In fact, even without orders in real battle they would act adequately to situations ;such as heavy infantry unit standing in an open field would change it's front in the direction of charging heavy cavalry, even without an order. It should be noted, moreover, that in addition to leader-in-chief of the army is also a lot of "smaller" officers, so leader-in-chief don't have to do everything himself, see everything, decide about every little aspect of battle. That's why I choose to play with pause.
I would like to know what do U think about this? I want to derive maximum enjoyment from the game while being in line with reality.Help me.

Question: When grouping units in bigger formations (alt+number key) U can give AI control of such group. How it's look like? whether it really in some degree relieve player, works as far as reasonably, simulating the activities of smaller commanders?