Is it possible to make the blur of the water clearer? It's currently WAY too dark by default for the project I'm trying to create.
This is not possible with Terrain Water currently. I do not know of any workarounds, other than creating custom water, which seems like a useless idea.
No. It's currently not possible, but they want to have more properties of water's appearance in the future.
This technically no way to do, but you can do a temporary alternate by making you own water system.