[c_of_red]

Basic logic says you cannot replay what hasn't happened. I actually like using the + key to set the first bombardment to turn 1 or 2. IIRC, the Units start the game in cover, which means a turn 0 bombardment won't be as effective. If you count hexes from the start line and get luckym, your turn 1 or 2 bombardment will catch units moving, which produces more casualties or a higher suppression number.
Another thing you can do is count and see how far you can get an FO and then set the bombardment to hit within that Fo's LOD the turn after the Fo can spot it. That means if you guess right, you can shift fires and really put the wood to them. Much better then 'shootin and prayin'.
Sometimes I will fire on a crossroads in the rear on turn 1. Not that it does much good, but because it was a historical use of arty by the Allies and the Soviets. Germans seldom had enough ammo to send rounds off in the blue like that.