I know this is a taboo topic and I apologize in advance if it violates any forum use policies, but here goes:  Hinterland does not condone the use of player-created mods and, understandably, discourages their use due to support.  I read through all the great ideas coming in on the Wish List forum and it seems that if HL did support mods, that this would prompt more mid-to-end-game interest and also possibly free up some HL resources to work on more intensive game improvements/enhancements.