Hi, because a lot of times, at least I do, combine bitmaps mixed generated maps like Corona round edges, Corona distance, noise, and and other maps to to various things and then use the maps for various stuff, like in corona scatter, opacity etc etc... And some times it would be good to control the blurryness for transitions etc etc.
You won't be able to access the blur in bitmaps for anything else than imported bitmaps. Or am I missing some other place you mean where I can do this?