I've always wanted to see this in a game...
The idea would be that ships/constructions could be done either quickly and badly, or slowly and masterfully. For example, in World War II, the United States decided that it simply could not fight the German U-boats in the Atlantic, and so it decided to simply send over so many supply ships that Germany couldn't sink enough to strangle the American forces on the mainland. However, this concept would not have worked had American construction factories not been able to turn out hastily constructed supply ships.
Anyway, the point is, a little slider bar: quality =======|=== speed, would let us choose whether we wanted a high quality, carefully constructed ship. Alternatively, we could drag the slider closer to speed (as in the example above) in order to get the ship completed faster, but have it be more prone to attacks or mechanical failure. This way we could turn out massive numbers of ship during wartime, and during peace, revert to high quality constructions.
Thoughts?