ok, well, I just updated my build, you now have full model import options, you can import one chunk or everything, and you even have a rather fully featured subobject import as well
(

)
which is the only way to add subobjects currently (you '
should' be able to import directly from COB in addition to pof or pmf), unfortunately removing subobjects is still not posable, due to the fact that there are a _lot_ of interdependencies in regards to a subobject, it's position, the hierarchy, and ANY data that uses subobject number as a reference.
chunk Import is accessed through the load button on top of the editor (save still does nothing), and global import is a menu option under file.
BTW do we (everyone reading this) really want chunk export? is it really useful? I know I did it in Aurora, but it was mostly because I figured I could do it relatively easily and thought it would be cool, but now that the novelty isn't there I can't realy think of any situation were it would be very useful.