
Originally Posted by
Incomitatus
As far as I understand it, there is a serious technical issue here - namely that the 'end of whatever part of the file the faction slots are stored in' is an encrypted file, aka 'hardcoded', that could only be accessed through hacking the propriety code. Whereas the things which are regularly modified are text files or spreadsheets, and were designed by CA with easy modification in mind.
So yes, CA can make changes easily enough to roll out an expansion, because they have the internal software tools to allow them to access the appropriate files and make the needed changes, not to mention the legal right to do so. We have none of those things. We can only access and change what CA has decided to let us access and change.
An exampe: A lot of Empire: Total War folks are upset because CA promised modders access to tools that would make it the most moddable TW game yet... and those tools and that access has not been forthcoming.
Unless and until the source code is publically released, which may very well be never, the things you are asking for are not possible in a mod. Unless some nifty work-around can be developed like this 'superfaction' idea bouncing around here...