Since the next version is still in development, I'd like to make some suggestions. I've personally taken to modding my own version of the Tet mod while waiting for the next version to come. One of my changes was to create special "Explorer units" that are given for free to exploraring countres like Spain. Because sea movement is so slow and it takes dozens of turns to cross an ocean, I gave these special exploration units 10+ moves to make sure they could actually be of use and loaded them up with colonists. I also made them buildable higher up in the tech tree. For flavor, I renamed the starting units with names like Columbus, Diaz, and Magellan.