The ability to sell/trade complete systems .... eg a race develops the A-1 Railgun and sells / trades it to another race instead of sell/tradeing each individual componant
This would be fairly straightforward in terms of programming but without the background knowledge, would the second race be able to build it? For example, if the US gave Albania the plans for the latest Patriot missile, could Albania actually manufacture the missiles?
To take this suggestion one step further how about selling complete weapon systems? Sell 10x A-1 Railguns without giving the tech. I see backstab's suggestion as giving the information to 'licence produce' a system. Whereas, what I'm suggesting is just like selling Typhoon to Saudi Arabia. Of course you could retro-engineer the system maybe destroy the system to give you a random number of RP on the tech?
This is harder from a programming and gameplay perspective but probably more realistic. The problem is how you model the 10x A-1 railguns. Does Race A have to bulid them before giving them to Race B and if so, how do I account for that in the game. If instead you just say Race B can bulid 10 railguns and the program keeps track, that is no different than giving them the plans and if they are building it, how do you stop them building more?
This area of the game is very interesting but full of pitfalls. One option I have considered in the past is having Industrial Capacity (IC) instead of construction, fighter and ordnance factories. You have a pool of unused IC and you can devote a number of IC points to building a certain type of installation, missile or fighter. Once a production run is complete, you can build more of the same, leave the IC setup to build the same thing but dormant or 'release' the IC back into the pool. If the IC is released, there would be a period when it would be unavailable (6 months?) as it is being retooled. This mechanic could be reversed so that when unused IC is devoted to a new task, there is a retooling period before construction begins - this is more realistic but the former is easier. This would create more diverse industrial output and you could have a lot of different items being produced at the same time.
If the above was in place, you could take it a step further (a step too far, probably

If that paradigm was in place, then one race could quite easily pass on or sell manufactured components to another (the 10x Railgun mentioned above for example
Steve