Hi,
Personally, i don't like the idea of having units in brigades facing in two different directions.
My reason being:
A brigade of 4 infantry units in line one behind the other, with the rear two units facing in the opposite direction to the front two units. This brigade cannot be charged to the rear. As simple as that, the best an opponent can get is a flank charge. To me this penalises players who through either luck or skill have got their own units into position for a rear charge. It also means (and I intend no disrespect to anyone) that the player using this formation does not have to consider movement and the positioning of units/brigades as much. Safe in the knowledge that:
a) They won’t be charged in the rear, and all that entails.
b) They are in a good position to charge/initiative charge if the opposing unit(s) fails to charge them.
The brigade has two “front†edges.
To me this is a very defensive formation, that has all the benefits, but no negatives.
This could also apply equally to a cavalry brigade (i think). Two units in front, two more behind and facing in the opposite direction. You're not going to loose support bonus, as cavalry don't get it anyway. A very mobile block, with two "front" edges.
All the rules say is that a unit under orders cannot move more than they are allowed to. There is nothing to say what way the unit must face when it finishes moving. Therefore as far as i can see, the above formation is valid - unfortunately.
I don't think i will bother with a 2cm movement penalty "house rule", as there are enough other rules to get my head around.

Shane