I have just noticed that the little "edit" button in the Texture Map window dose not bring you to sapphire like in the heightfiled bit or w/e but instead brings up a little window where you can paint colour onto your terrain
Now at the moment this is not much use to me paiting 1 plain colour onto the terrain, but if we could paint a texture down by hand, which would also some how effect the alpha map too that would be really nice. Like painting a concrete area of the map where you plan to have a city for example like what I have just had to have done in one of the maps I was just making, thou I did all the concrete painting by hand in the BF2editor.
Anyways basically all it needs is to have a new box where you can select a texture, some how tell it to paint between the texture and colour and then for you to freely paint that texture over your terrain
anyways just an idea, would help alot if it effected the alpha map too also
EDIT: also with maybe some way to save the layers you have painted so if you need to regen the underneath you dont need to repaint your layers, just import them some how