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The reason why its difficult to make a complete Rome-Focused, centric mod, is because there are no specific files just for Rome.. All the moddable files for the Titles, and everything, not only change Rome, but all other countries who are republic oriented.

Secondly, the Consul and Senate mechanism is still unavailable to the modders, so its extremely hard to make a Rome-focused mod, if you can't mod those 2 things.

There is however, some minor things you can do.. For example, I simply modded my Titles.txt to have some requirements for being a Governor, (EG: They had to be either a Pro-Consul, Former Consul, Propraetor, or Former Praetor) this way at least, not just anyone can be a governor which is nice. I also modded the years in term for all terms, to 1 year instead of 2 year. So that totally helps get families on the political track faster and also helps with the roleplaying aspect too.

However, doing anything more then that, like maybe making requirements for each Technology, (EG: They had to be Aedile before Praetor, etc..) is pointless cause there's to much balance in the gameplay that needs to be done, and also, since you cannot mod the consul mechanics, it makes the requirements even more pointless too, since sometimes a nobody can become a consul and everything.

But one day, maybe Paradox will open more stuff for Modding within Rome, and honestly this is what I'd like to see:

1) Units, during the early Roman time frame before the Marius Reforms. Rome wasn't made up of just Principes, they had Hastati, Principes, and Trarii troops. And Techinally, those should have only been built in Rome, all other provinces should have ally units. Even after the major marius reform, which are the legions we all know and love today, you still see them as Principes, etc, so thats sort of lame.

2) Titles and Senate Mechanics -- The first point was a long stretch, but hopefully this would be more likely. If their able to open this up for modding, and allow us to edit the Senate, Consul, and Titles mechanics (without unbalancing every other nation) that would be awesome for our modders.

Of course I can be wrong in some of what I said, so by all means, if any of the more professional modders wish to comment, please do so :)

MP
 
Actually I have modded my game to make Rome specific titles, all it requires is the "tag = ROM" phrase, I made praetor peregrinus to give Rome another military commander.

Also it's AFAIK it's entirely possible to change the consul mechanics if you change the requirements to be leader, as far as I am aware all candidates must fit the requirements (like age = 42 in the vanilla game) but if noone fits all the requirements then the game ignores the requirements completely ensuring that their are always candidates, which is quite realistic really.

Also you can mod the senate mechanism slightly as you can give senate influence to custom titles which increases the desirability of the holders party like I did with my new praetor title.

As for balance, it is hard to know what effect a modification will have on balance but in my opinion vanilla isn't balanced perfectly anyway.
 
The reason why its difficult to make a complete Rome-Focused, centric mod, is because there are no specific files just for Rome.. All the moddable files for the Titles, and everything, not only change Rome, but all other countries who are republic oriented.
Actually, you can make titles country-specific if you wanted to. Other things (not sure what else you're talking about) you might also be able to restrict in the same way.

1) Units, during the early Roman time frame before the Marius Reforms. Rome wasn't made up of just Principes, they had Hastati, Principes, and Trarii troops. And Techinally, those should have only been built in Rome, all other provinces should have ally units. Even after the major marius reform, which are the legions we all know and love today, you still see them as Principes, etc, so thats sort of lame.
I reckon these are actually moddable. I haven't yet explored the various options, but I think there might be a way to add entirely new units to the game (as opposed to simply modifying existing units).