I posted a few days ago in BAT Tech Help about an annoying little detail I observed where lakes and rivers above sea level are concerned. Have a look:
As you can see, the water isn't visually at lake level. Planes behave as if the water is actually there despite looking like they're sitting on the edge of a void into the second dimension.
What I'm requesting is a few different sizes of a special "plate" object without any collision that looks like water, allowing these voids to be filled with something that makes it look a thousand times better. The plates would appear just a hair below the physical surface level so they merge nicely with the surrounding shores without clipping through them. Lakes like the above example (on the map Kuril Islands and Attu), rivers above dams on the North Korea maps, etc. could all be patched up to look much nicer.
Ideally, the plates would have animated waves just like the normal water in the game, although this could potentially cause lag and/or look funky when the plates are rotated.