@Macaoidh:
I do like the simplicity of re-rolls or “free hits.”
The beauty of House Rules is that in your basement, you are the King. If you like this rule, use it, if you don’t like it, trash it. Your basement is like a free country, man.
But, when that is said, the idea of Free Hits sound to me like a Blockhouse, Pillbox, the Tank from A&A 1914 that absorb one hit when attacking, or the Battleship that takes two hits to kill. Now, is your Leader a Fortress ? An even worse idea is the +1 modifier. Techs will boost your unit +1, and Combined Arms will boost your unit +1, and if you play with terrain I guess mountains will boost your defenders +1. Is your Leader a Tech ? And the abilities, that looks like its lifted from the National Advantages option rules from A&A Revised 2004 edition. Is Patton the only Leader in the world that was able to retreat ? When I read history book, I figure he was not. Retreating is pretty common, you just cant do it in this A&A game because it will ruin the game.
The only Leader rule that is absolute unique is the rerolling of dice. A units combat value is its firepower. A Tank or Infantry unit will have just so much firepower, no matter who is the Commander. But a skilled and cunning Leader will find a better way to use that firepower, and a better way to roll that dice. So I guess rerolling of misses is the most elegant Leader rule. IMHO.
And to honor the traditional Keep it simple stupid KISS rule that is a trademark of A&A, I think the Leader unit should be a generic plastic piece, because Rommel could do nothing that Patton could not do too. A Leader is a Leader. The only difference is that Germany and USA should have more Leader units than the others, because they had the best leaders. Russia should have maybe one because Stalin had just purged most of his officers and generals just before the war started. But then, we are talking balance and playability. Remember its your basement.