-How does the supply thing works? like, how do I improve supply in hostile territory? - you resupply in friendly cities
-Is there a guide detailing what do I need to build to get certain Buildings? - in game building browser is usually good enough, and there is a government building browser somewhere.
-Is there a detailed guide to all characters' ancillaries and traits etc? - I have seen a guide. Check FAQs or changelogs
-Is there named legions? how do they work? - no, just nameless ones. Its based on the extended
Greek mod.
-Is it advised to use loyalty? I was put off by the warning that something may not work if I enabled loyalty, can't remember exactly what it was. - a few bugs, maybe, or annoyance due to armies occassionally abandoning you.
-The Carths have eliminated the roman rebels and I don't have loyalty enabled, will they emerge again if one of my city rebels? - I think if the Carthaginians have replaced the rebels, then the rebels aren't actually in the game, and thus won't emerge
-If I installed XC with certain options but then I want other options enabled, do I have to reinstall? and if so, just reinstall as is or do I need to erase the mod folder or what? - just reinstall. I think
-Does the mod uses scripts? if so, how can I tell if they are working? I read that it uses a garrison script, but then I read that this mod doesn't use a BG script, so how do they do it? - if a important city is attacked, at the end of that turn an army spawns in it.
-I have a skirmish unit available of Greek origin it seems, every time I have an auxilia barracks in Italy, what's up with that? their unit picture is missing and it shows a unit of peasants, I think they're called akintontistai or something. - I think they're javelin throwers. The peasant unit card is a default.
-I want rebels appearing and a garrison forming every time I siege a city, what options should I enable to get this? - big cities are the only ones with garrison scripts to my knowledge
-is There a 4tpy script? does it fixes building times to account for more time? - no
-To send your FM to study abroad, I read there's some cities that have special schools, do I have to be inside the city, I mean do I have to own it or is a matter of simply staying in the area around the city? If I own it then, they aren't really studying abroad do they? It confuses me. - Have you FM govern a city for a few years (Pergamon is a good one)
-Is work going to continue on this mod? what else is going to be implemented? - XC 5 is going to be released, I believe. Ask Zarax what is changing.