[Singollo]

How about these for "racial techs":

--Religious (Religious)
--Gemworking (Crystalline)
--Sanitation (Organic)
--Construction/transportation (Temporal)
--Shamanism (Psychic)

These would obviously have far different effects than their counterparts, and they need not be modeled after the counterparts at all. (I do so only because it's easy, and for reference purposes.) This would do well to account for the various cultures that might be around in a Roman Empire type game. The Romans would be religious, obviously, while the various Germanic tribes might have Shamanism. (Perhaps "Druidic" for Pictish/Celtic cultures?) The Romans would also have Construction/Transportation, while Middle-eastern cultures would have mercantile technologies such as Gemworking. Indic civilizations, renowned for their sanitation and mathematical city plans, would have Sanitation, which would bestow population and happiness modifiers for various buildings (facilities).

There are many other ways to go with this, that need not have any parallel to the SE4 tech fields. Any ideas?