Have you tried :
PHP Code:
campaign imperial_campaign
options bi
playable
romans_julii
egypt
seleucid
carthage
parthia
gauls
germans
britons
greek_cities
macedon
pontus
armenia
dacia
numidia
scythia
spain
thrace
romans_brutii
romans_scipii
end
unlockable
end
nonplayable
slave
romans_senate
end
This is my descr_strat ( except that Scipii and Brutii are in the non-playable string ) and I can play with any factions except Scipii , Brutii, Senate and Rebels .
Also , you should remember a few things , as posted on rtw.heavengames :
There are three other things you have to keep in mind. First, the faction selection screen can only display 20 factions, so you'll have to leave another faction in the unplayable section if you want the Rebels (Slave) to be available. Secondly, when playing as the Senate the game will crash if you look at the "Senate" tab in the faction scroll. Third and last, the Rebels were never meant to be played and it is possible that you will get random crashes if you're playing them.