Originally posted by Angrybeard:

Originally posted by Hiryukaen:

Could be, but it would have to be re-coded from scratch. That's a lot of work and it would have unknown performance issues. Adding that much extra physics to a game that already isn't optimized and may not become very optimized could make it unplayable for the vast majority of people who already paid for it.

What im saying is that it's already coded in the game. but with different color (black). I don't think we can get a fully realistic stream of water, but having small lakes or creeks on elevated positions (above sea level) is already done, just need to retexture tar.

The problem with this, is that there isn't really a reason to add inland lakes, as most of the games map is sea. it wouldn't be as simple as just a retexture as the gimmick of tar pits is that the tar disappears if it reaches a lower elevation, that wouldn't make sense for water. Water creates paths as it moves and moves to follow paths, to add actual water physics, water that can flow according to the terrain, would require a crap ton of computation. Additively to make realistically flowing rivers that go from the mountains to the sea would require a tremendous amount of coding and would massively overcomplicate world-gen, so it really isn't worth the payoff.
I suppose i could see an argument for little inland ponds, if there's a crop added that is required to be submerged is freshwater to grow, like rice for example. But other than that I don't see a point.

EDIT: The closest thing we'll probably see to an inland lake is a frozen lake in the Deep North biome.