Looks like there has been no progress in this project for a while. I've forked this project and have been working on updating it to the latest Roslyn codebase and addressing the limitations.
the code is over at github
in case anybody is interested in using and / or contributing.
I will be incorporating bits of the open sourced library codebase from microsoft on the framework side to start filling in the gaps in base class library implementation. (will eventually see if it can be contributed back into the main microsoft codebase)
Initial focus will be to get the base class library to support the microframework profile.