Guys, no tanks, please. If you want to have a tank at this scale - well, some of the fire missions have effects similar to those a tank main gun shot would have in this scale (as opposed to, say, bombs - which would obliberate half of the battlefield...), so just change the names of FMs. I'd say, that APCs, giant suits of armor, battlewalkers and other such light armored vehicles are the biggest and baddest units that may be supported by UWZ. Even that support is not that great - it is far too easy to kill such stuff with rifles, and the anti-tank weapons (like DLDs and standard rockets) is not always the best choice for hunting the big game (as they're expensive, inaccurate and do not deal much more damage than - say - HMG). It is an infantry game after all. Adding APCs and other light vehicles to armies that do not have them may be a good idea (although an APC-equipped Mishima force would be scary), but as for the heavy stuff: Just Say No.
As for a separate tank combat game: I think that EE is already doing so many different things, that starting development of yet another miniature system would not be a wise move. If you want to play such system, I'd advise you to take a look at either Mein Panzer or Modern Micro Armor - both have excellent game mechanics, well support infantry and mechanised units, and allow you to design your own hardware (as the necessary formulas were made public). Converting Warzone unverse units to either system should not be difficult, and both system work well with 1/300 miniatures - so it is easy to play HUGE battles with them (and there are many 1/300 scale minis on the market)