Hi,
Some people were not even awake when you asked your question, or made the second post!
If you look at the documentation you'll see only the Containers, Math and Smart Pointers libraries are included. However, the headers for many of the other libraries are included in the plugin. Most likely boost::thread isn't supported. The easiset way to find out for sure is to try to build a project that uses it. I'd expect it will compile but not link.
If it isn't available you could always port the library yourself, since it's based on pthreads which (mostly) work in Open C.
Sorcery