Sorry if something like this was already posted
Anyone who's ever read a fantasy book or played a fantasy themed game can agree with me that certain races have access or use only certain types of technology. For instance, dwarves, as we know, are naturally industrial minded and thus they have better mining facilities, forges, etc; where as elves, especially wood elves, tend to be more rustic nature oriented. What i'm suggesting here is to have race/culture specific tech trees to make the races more unique.
A simple method is to have basic categories:
1.) Balanced
2.) Warrior Culture
3.) Industrial Society
4.) Merchant
5.) Pacifists
6.) Nature folk
so are you're ideas?