First of all, you should not be able to establish embassies with Barbs, but wouldn't it be nice to negotiate with them to aid you in battle against another civ, or pay them off so they don't attack you? I think it should be possible to trade techs with Barbs also, but only military techs. Barbs do not care about party or reading or writing, but they sure would like to get a hold of the tech of gunpowder. Perhaps you could give it to them for an alliance? I would like to see Barbs be alot more dangerous and interesting than they are now. Maybe if you play your cards right you could get the Barbs to merge with your nation and so their camps become cities under your control?
If you think alliances with Barbs is ridiculous, just look at history where this has happened quite often.
If you think alliances with Barbs is ridiculous, just look at history where this has happened quite often.