Go to the Medieval II:Total War folder and find \data\world\maps\campaign\imperial_campaign from the top of the window. Once you are there, find the file descr_strat. Open it with a text editor (Word, or somthing like that). Cut and Paste the 'unlockable' section into the 'playable' section and save the file. Launch the game and you should have every faction available. Make sure to backup all those files you are going to change so if you mess up, you don't have to reinstall the game.
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No it is not an expansion. It is the 4th game in the Total War series. So, you don't need any other game to play it. And if you want to get it's expansion it's called Medieval 2 Total War: Kingdoms.
Hotweels games are good but to unlock them at first its simple but then it gets harder. You can also unlock other cool stuff.
unlock all the other characters first
now its a demo you can only unlock black mage now by brawling 10 times. when other versions come out, you can unlock other characters.
you unlock mini games but defeating other dances example: Elvira