I am not a member either, but I can give you an answer for the the culture swap thing.
In RTW 1.2, there are six cultures: roman, greek, eastern, carthaginian, egyptian, and barbarian. Each faction in the same culture must share the same building designs and some other stuff. There is a maximum number of factions that can be a part of each culture. Here are the internal faction names and there cultures:
Roman Culture: romans_julii, romans_brutii, romans_scipii, romans_senate
Greek culture: greek_cities, macedon, thrace, seleucid
Eastern culture: pontus, armenia, parthia
Egyptian Culture: egypt
Carthaginian culture: carthage, numidia
Barbarian culture: gauls, germans, spain, dacia, britons, scythia
The Roman culture makes it difficult to mod factions if you do not want to have multiple Roman factions. Many mods leave brutii, scipii, and senate out. RTR did this with their factions:
Roman Culture: romans_julii (Rome), romans_brutii (empty), romans_scipii (empty), romans_senate (empty)
Greek culture: greek_cities (Greek Cities), macedon (Macedon), thrace (Bactria), seleucid (Seleucid Empire)
Eastern culture: pontus (Pontus), armenia (Armenia), parthia (Parthia)
Egyptian Culture: egypt (Ptolemaic Empire)
Carthaginian culture: carthage (Carthage), numidia (Numidia)
Barbarian culture: gauls (Gauls), germans (Germans), spain (Iberians), dacia (Thrace), britons (Illyrians), scythia (Sarmatians)
In order to maximize the number of factions, the EB team swapped the culture. The roman culture became and eastern greek culture, eastern became steppe, greek became Greek and Roman, Carthaginian became Pontic and Egyptian, the egyptian culture became a Carthaginian culture, and barbarian stayed the same. This is what they did:
Roman Culture (Eastern Greek): romans_julii (Arche Seleukeia), romans_brutii (Baktria), romans_scipii (Hayasdan), romans_senate (empty, not usable with 1.2)
Greek culture (Greek and Roman): greek_cities (Koinon Hellenon), macedon (Makedonia), thrace (Epeiros), seleucid (Romani)
Eastern culture (steppe): pontus (Yuezhi), armenia (Sauromatae), parthia (Pahlava)
Egyptian Culture (Carthaginian): egypt (Karthadast)
Carthaginian culture (other eastern greek): carthage (Pontos), numidia (Ptolemaioi)
Barbarian culture: gauls (Aedui), germans (Sweboz), spain (Iberia), dacia (Getai), britons (Casse), scythia (Arverni)
1.5 allows modder to change a factions culture in the descr_sm_factions.txt file. The team should be able to clear up any problems caused by the culture swap. The romans_senate slot will also become usable and they will create a new faction, but I don't know what it is. The Yuezhi will also be replaced by a new mystery faction because their main enemies for most of the game live east of the edge of the map.
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