If this is even possible, please consider it for an update...
In the past it has been stated that we cannot paint any texture on the ground because of limitations with textures,
(This limitation means if you sculpt something, it has to be painted a ground texture, and unfortunately it can't look as realistic as it could).
My request that you add some "Air Brush" type of tool that would let us choose any solid color from an RGB slider, and paint it overtop of the ground textures that are already layed down in the map.There should also be a size slider so you can make small lines and curves and details (as small as the game textures will allow) and scale it up to a max size to cover the initial color blends.
With this we will be able to make very detailed painting on top of the textures we form out of the terrain and it will not be limited to the colors of the textures under it.
