well maybe i just havnt found it yet, but how come theres no way of editing the alpha channel as just a black and white image, separate from the actual colour info.
what i mean is
-you have a cloud texture which fades to black on the edges,
-first you draw white everywhere on the colour info
-then you click "edit alpha channel"
-all the transparent parts go black, and all the non trans go white, ect you know what i mean
-then you load in your cloud texture as the alpha channel
-you unclick "edit alpha channel"
-and your left with a clean cloud which looks like a cloud.
I Think this is an essential feature for using alpha channels, its not feasible to make one by just drawing in varying opacitys when you have one for something as complicated as a cloud