Sorry, but I have no intention of adding emerald to the default install of Ubuntu MATE. Nor will I be back porting emerald.
I have to draw a line somewhere. Full compiz support out of the box, with proper MATE integration and a sane profile with one click enablement is what most people will be happy with. This setup integrates with the Appearances control center applet for changing the window manager theme.
I’ll leave installing emerald and tweaking it’s themes to the Compiz enthusiasts, such as yourself