ILDasm.exe and get the IL for your viewing pleasure. Utilize shared extensions and enhance any type you feel needs "opt-inable" improving. The only thing you're pseudo-kept out of is the VES, but nothing's telling/restricting you from creating your own runtime hosts. It's what I'd consider client-cloned open source. Do what you want, extend as you need but ultimately the direction and decision for global enhancements is left with a heavily vested company instead of a users community.