Some of the house rules that were published in the forum over the years could be fairly easily included in the newer version. I could think offhand of a few such rules, like the 'NCO' one where you get to remove a suppression marker 'for free' for instance. As I mentioned, I'm really keen on the concept of directional damage. Something like simply adding +1 to the armor rating to the AFV's front.

In the end however I think that the core mechanic (a unit either engages, advances or strikes) should be left alone as it is simple yet elegant. A revised edition might benefit from a few new wrinkles while keeping the core mechanics intact.