I am not sure what you're needing/liking. You wanted a way to have more generals(more armies) regardless of your imperium level. Yes? There are a host of different mods in the workshop on steam to accomplish such a thing.
Now, if you're asking how to actually mod the game yourself to accomplish the same end result, I personally would suggest posting in the discussions section of the Rome II workshop on steam. I myself have posted there with similar questions. If this is what you're trying to find out, I am grossly underqualified to answer. hehe
If I still haven't hit the nail on the head, I apologize.
and yea i will make myself (modding) becuase i know there 2 mod who make more general one is out of date since ~6 month and the other ..hmm i dont like the limit he made:/..thats the reason i will make myself..so i can balance it for what i need/whant