1 - Change to a one point feat for the DLC building materials so you only learn what you want to build.
Next one is somewhat more complicated.
2 - Similar to above but with two feats. One for heat insulated (build with reinforced stone building materials) and one for cold insulated (build with reinforced black ice building materials). With this, you could build heat insulated Khitan buildings in the desert and cold insulated Aquilonian buildings in cold areas.