It was probably me that asked you about it. No, there's no reason you can't paint the map by hand, it's just a total pain doing it. The idea of something like this is that you can save yourself days of agonizingly dull mucking about by running the script and getting a jpeg that shows you exactly where you need to put your grime. I see the script as being a time saver that helps you create your texture map. When you work with models of buildings or industrial objects, there are often parts which intersect and should have grime at the intersection point, but which do not have the intersection point marked on the UV map. This means that to figure out where to put the grime, you have to take a guess, draw it on the texture, render, see how well you guessed, then adjust your texture and repeat until you've managed to put the grime in the right spot. It takes ages. Even something that just draws the intersection lines onto the UV map would be tremendously helpful, but something like DirtyNuts will not only find those correct spots on the UV map for you, but will also draw the grime there so you can just composite it with your colour map to get a nice dirty texture.

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