I think they should add a Ranking for your Army on MTW 2..

you should be able to sign your army up at,say,totalwar.com
I'll use my Selecius for this Matter
4 Silver Sheild Pikes
4 Phalanx Pikes
4 Legions
2 Chartios
3 Eles
3 Cats
so, you go,say, send them a pic of your army in a army deployment stage, on SP or MP, and tell them the units,and they shouls sign your army up..

you should be able to play witho ther armies, but if you say,win 100 games with the army you signed up with,with only losing 10 games or under (100-10) then you should get,a free copy guide for MTW 2. winn 500 games without losing more then 40 games or more, then you get 2 free copies of TW games (STW and MTW for example)..