In Civ4 there is the promotion system which allows units to be specialized. in SMAC there is a unit workshop which allows units to be specialized. Does it make sense that units have to go through combat to learn how to defend city walls?
I kinda like the promotions. Combined with the workshop that SMAC have, I think we could have more interesting combats and such.
Also, I would like to see that each faction in a future SMAC 2 has Unique Weapons, Unique Armors, Unique Buildings, Unique Chassises, Unique Promotions and Unique Abilities for each faction!
I would love even more distinctions between each faction so, that in a certain way NO FACTION IS EQUAL TO THE OTHER, but the game can still be fair for all of them! I think the original Alpha Centauri archieved a good lot of distinction and fairness, and each faction is good and unique:
Gains are ecollogical and get mind worms and efficient grow, bessides good fungus.
Believers are great warmongers but got slow research and are a little bad in ecollogy!
Morganites are bad war mongers, but playing well, you can become easily rich! And you have to watch out for the Gaians!
Spartans are the ultimate warmongers. Build a army and crush someone, it's what are you good with!
Peacekeepers aren't champions of efficiency, but can use the planetary concil to their liking, got extra talents and a bigger city early limit!
The University got big ethnical and security problems, but they can easily walk over anyone with better weapons than anyone else!
The Hive does get some economic problems, but with growth and industry and a immunity to the penalties of planed economies and police states, you can have a nicely industrial police state with booming growth!