MTW is pretty mod friendly
as the files with data are essentially text files. I am playing the Sicilians and it took only the following to do that:
"Sicily = major"
There are several good threads about moding the game at the MTW site.
But (and this is a big Bertha butt), it is not as flexible as EU. You cannot have more than 12 playable nations and you cannot change the status of an original "major" (like the Almohads) and make it a minor and have another minor (like Novgorod) take its place so that it becomes playable. No switching in other words. The most you can do is add the 12th playable nation (the game starts with 11 "majors" which are the same as playable nations/factions). And, you have to add from the small set of available minors unless you wished to do major text and image editing to play a faction not included in the game.
You can do a lot though to change starting stats like province development, treasury, units available. You can also edit the map. I did that too and it was easy.
But of course all this pales compares to the mod utility / scenario editor that was added onto EU2 for free.
*Oh, and BTW, you can increase the cost of the "strategic units" (see post above) so that the AI and the player don't crowd the whole strategy map with them.
as the files with data are essentially text files. I am playing the Sicilians and it took only the following to do that:
"Sicily = major"
There are several good threads about moding the game at the MTW site.
But (and this is a big Bertha butt), it is not as flexible as EU. You cannot have more than 12 playable nations and you cannot change the status of an original "major" (like the Almohads) and make it a minor and have another minor (like Novgorod) take its place so that it becomes playable. No switching in other words. The most you can do is add the 12th playable nation (the game starts with 11 "majors" which are the same as playable nations/factions). And, you have to add from the small set of available minors unless you wished to do major text and image editing to play a faction not included in the game.
You can do a lot though to change starting stats like province development, treasury, units available. You can also edit the map. I did that too and it was easy.
But of course all this pales compares to the mod utility / scenario editor that was added onto EU2 for free.
*Oh, and BTW, you can increase the cost of the "strategic units" (see post above) so that the AI and the player don't crowd the whole strategy map with them.