Unsure why our map is like this (Halaa) When using the terrain editor the black tiles are unable to be selected and changed unless first we alter the tile in-game (raise, lower, flatten, etc) once altered we can edit the tile as normal in the editor change material, altitude. Is there a way to make these tiles editable in an easier manner?

The black tiles mean that there is no information about these tiles in the database. it's usually the case with deep water tiles.
But you are right, there is a bug that doesn't let you select them for edits. It will be fixed in the next update.

As always you are right they are pretty deep water tiles at about -9.9 , than at some point drops easily too -200. I am extremely happy to hear it's going to be an option soon, we've dropped easily 500k soil covering tiles underneath the water.

It should be fixed with todays update.