[boost] Boost.Build v2: Native/non-native wchar_t in msvc toolset

Hi All! I remember that in the first Boost.Build there was an option which allowed to choose whether native wchar_t should be used or typedef-ed to "unsigned short". In v2 the behavior seems to be hardcoded as "always native wchar_t". Is it possible to bring this feature back? -- Alexei Alexandrov