Sure, SurfaceSpread is nice and has many useful options, but its not really faster than the mograph stuff. Thats the big advantage @ CarbonScatter.
I had a bug with SurfaceSpread: It was not possible to populate the patches with a normal alignment. So i had to change to mograph cloners. But C4D and scattering is as we already found out a pain in the ass... To be honest, i dont think that there will be changes very soon, because the viewport core in cinema unfortunately supports just a single core. They need to change the whole C4D core, which would take a long long time.