It seems like we have a lot of techs in Civilization and Warfare but not very many in Magic, Adventure, and Diplomacy. I seem to have 5-6 choices every time I research Civ or War, but only 1-2 choices in the other tech trees.  Can't we balance this out a bit by putting some of the techs in Civ and Warfare in the other tech trees.  For example, the tech that unlocks the building of inns or harbors could be put in Adventure.  The tech that unlocks a palace or city walls could be put in Diplomacy.  The techs that unlock schools or staves could be put under Magic.