Well, yep, I was planning to mod some features on the game. But I am not a professional and I have not enough time to deal with all the points involved in a great mod.

My plan is to make little changes just like I did in MTW before and after installing Wesmod, then wait until the expansion and once we can play the final decades of the Roman Empire that is the only period of Rome I have a decent knowledge about, then perhaps I'll put aside all the changes and try to create a realistic mod about the fall of the Roman Empire (and the rise of the Byzantines).

Better voice acting

It's quite irrelevant to me

Voices in native tongues

We will need to be specially skillfull in languages

Infantry speed
Killing speed

Yes, I still think the killing speed is too fast.

Making the UI more like MTW
Improving the AI

Yes, improving the AI will made the game infinetly better, but it would be specially hard.

Good points.