Compiling UE4 with /MT (statically link C runtime)

I have a library (namely CEF with sandboxing support) which doesn’t support dynamic linking of C runtime on Windows (CRT) (/MD flag) which is used by Unreal by default. Is there a way to compile my project or UE4 with /MT (static C runtime linkage) instead?
I’d also wonder why /MD is the default? I guess maybe reducing compile time or reducing the size of the output.