The "Captured elven workers can chop forests" bug got me thinking that this is actually a reasonable feature. If you capture a unit that knows how to chop down tree how do they then forget how they managed the feat? As the worse that unit should still be able to perform their actions and provide trainging if you are able to acquire the necessary resource to make the "tools". Maybe the "how-to" be able to create the necessary tool could be granted through a "Reverse-Engineering" technology. Would adding a "can be reversed engineered" flag to technologies be doable and desirable to the game (both FfH2 and even the core civ game)?