As far as we've noticed, there aren't any textured background settings at all, not even fade color. The eight bytes in TMAP immediately preceding the textured background itself would be a likely candidate, but they can be edited freely without seemingly having any effect. Besides that, it's not clear where to look, since by its nature any mode setting is going to be set to 0 and there are a lot of zeroes floating around. In any case, given that there's no fade color, I'd say the chances are pretty low.