Then you really miss ALOT. here it goes:
go to C:\Program Files\Activision\Rome - Total War\Data\world\maps\campaign\imperial_campaign\descr_strat
you find there a list of factions, some under the name of playable, some unlockable and some unplayable. place all of them (except slave and Senate) underneath "playable".
If you have 1.3, you must give each faction a campaign description. that can be done at
C:\Program Files\Activision\Rome - Total War\Data\text\campaign_descriptions
This is what I've put there, you can copy it over there:
{IMPERIAL_CAMPAIGN_ROMANS_SENATE_TITLE}SENATVS POPVLVSQVE ROMANUS
{IMPERIAL_CAMPAIGN_ROMANS_SENATE_DESCR}You are the senate and the people of Rome. Good luck.
{IMPERIAL_CAMPAIGN_ARMENIA_TITLE}Armenians
{IMPERIAL_CAMPAIGN_ARMENIA_DESCR}You are the people of Armenia. You have good infantry, incredible cavalry, and an unfulfilled desire to rule the world. Good luck.
{IMPERIAL_CAMPAIGN_DACIA_TITLE}Dacians
{IMPERIAL_CAMPAIGN_DACIA_DESCR}You are the people of Dacia, a Thracian tribe. You have decent infantry and archers, and siege units at your disposal. Good luck.
{IMPERIAL_CAMPAIGN_NUMIDIA_TITLE}Numidians
{IMPERIAL_CAMPAIGN_NUMIDIA_DESCR}You are the people of Numidia, a desert tribe with light desert troops at its disposal. Good luck.
{IMPERIAL_CAMPAIGN_SCYTHIA_TITLE}Scythians
{IMPERIAL_CAMPAIGN_SCYTHIA_DESCR}You are the people of Scythia, a nomadic tribe with strong cavalry at its disposal. Good luck.
{IMPERIAL_CAMPAIGN_SPAIN_TITLE}Iberians
{IMPERIAL_CAMPAIGN_SPAIN_DESCR}You are the people of Spain, a barbarian tribe with both Carthaginian and barbarian units at its disposal. Good luck.
{IMPERIAL_CAMPAIGN_THRACE_TITLE}Thracians
{IMPERIAL_CAMPAIGN_THRACE_DESCR}You are the people of Thrace, a barbarian tribe with Greek and barbarian troops at its disposal. Good luck.
{IMPERIAL_CAMPAIGN_SLAVE_TITLE}Rebels
{IMPERIAL_CAMPAIGN_SLAVE_DESCR}Wrong people!!! choose another faction icon!!!
Now you should be able to play all factions. Good luck, and remember: always backup any modded files!
"One day, my quotes will stand in signatures"
Sjonnie
Quod licet Iovi non licet bovi