Playing with general camera is one of my houserules and with this setting delegating some units under AI control is often a must. Contrary to opinions stated above, I was pleasantly surprised with the performance of AI. While not genius, it did it job...of keeping his units alive and grouped ("in formation" would be a little far-fetched). The trick is to give AI units, that are already in formation you won`t them to be. Don`t count on brilliant outflanking maneuvers or coming to your help, when it`s needed - but AI is capable of handling it`s portion of the battleline (against equally dumb enemy AI, that is). Some surprises are inevitable, but such is a hazard of battle, is it not?

Granted, I play with alex.exe and Sinuhet`s formation mod, so that may have made AI smarter, than in vanilla EB.