Written in stone?

[ZeroAdunn]

Here's a way I think you could do it.

Before beggining of the game create a advanced traight for each race (just call it the race name) This will work just like for organic or whatever tech.

Then all tech that you want to add for each race just give it the requirement of having the race tech you just created before you can research it. If you want anyone to be able to research it don't. (also if you want them to be able to trade it simply don't give it the racial req.) This will preven other races from researching it but trading for it should work (I think) maybe even stealing it too, but I'm not sure.

You can change the tech area, vehicle size, comps, components enhancements, and much more without screwing up the game.

That was an excellent Idea for a game you presented.