meby this could be a feature of small skirmmish battles only.
As you only have a few troops on either side the need for an overall tactical view is smaller thus allowing you to take personal control.
As a battle gets bigger as a commander you would HAVE to step back a bit so you can judge the overall battle.
this would prehaps add a small element of realism.
GM-ing of crops is rife yes? so why have i not yet seen a 10ft killer tomato? to me thats just lazy!