Doubtful, unless someone has the time to code the support in MultiMiner (I do not). I've asked the SGMiner folks to contribute their changes back up to BFGMiner but they are not interested in that.

In the meantime, many of the useful features found in SGMiner are already ready for BFGMiner 4.0 (and some of them made their way back to SGMiner, if you check their commits). BFGMiner 4.0 has support for shader-based intensity, multiple gpu-thread settings, higher intensities, as well as early support for ASIC Scrypt miners. I'd personally rather spend my time focusing on improving BFGMiner.

MultiMiner is Open Source though and again I'd welcome anyone to contribute source that allows it to use multiple mining backends in a clean way, as long as they are willing to maintain that code.