I hate to add to this thread, so many requests...
But could we get a version that flat out ignores the signal line and colors according to the histogram with respect to itself: above 0 and ascending, above 0 and descending; below 0 and descending and below 0 and ascending. So no signal line, just the MACD line, which in this indicator is the histogram, with formatting options.
Also, a zero line that isn't red would be nice, any shade of grey or black would do fine.