I have mentioned this in the course of another post or response before, but the more time I spend playing, the more I find myself wanting an Alchemist type improvement so that I can exchange resources.
E.g. 2 gildar -> 1 material, 5 material -> 1 metal, 1 horse -> 20 gildar
You get the idea. Would be a little more flavorful if they weren't fixed exchange rates either...a little natural variability over the course of the game would be nice for repeatable game play.