There is no real point, SPQR is exactly the same as any of the other three Roman factions except it includes bugs that crash your game. You are far better off playing as the Julii, Brutii or the Scipii.
The only diffrence is that you don't get bonuses in the Temples.
I.e. The Brutii can get a +3 XP on all new units, in the Partheon of Mars..
S.P.Q.R Don't have those Bonus options..
But if you are good at editing Game files, you can change who is allowed to build what..
[Edited by Wolf-dk1984, 5/6/2010 2:17:10 PM]