Go to Rome:Total War, Data, World, Maps, Campaign, Imperial Campaign, Descr_Strat and then you'll see:
campaign imperial_campaign
playable
romans_julii
romans_brutii
romans_scipii
end
unlockable
egypt
seleucid
carthage
parthia
gauls
germans
britons
greek_cities
end
nonplayable
romans_senate
macedon
pontus
armenia
dacia
scythia
spain
thrace
numidia
slave
end
All you have to do is cut the ones from non-playable(except for Senate and slave) to the playble.
It's that simple *sighs*.
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