IF somebody wonders, there is NO research in Rome TW. What it actually contains are pre-planned events notifying players about occurrences of inventions of watermill, compass, gunpowder, etc. Also, it contains some game-mechanics absent in Dominions, such as combat bonus in certain terrain, or fear caused to infantry/cavalry only (famous camels!). And it doesn't contain magic or, e.g. flight. And this is without mentioning such negligible fact that RTW uses 3D real-time tactical engine...
There was an attempt at WarHammer Total War mod, but I'm not sure how close it came to modelling fantasy, as I personally couldn't make it work at all. And at the time of its disappearance from the Web its authors made only 3 WarHammer armies - Empire, some Chaos & High Elves.
As for Dominions mod - you would probably need to re-write main game engine to include provincial buildings..
hmm.. It was a joke, right?