"But the only two I am able to check and uncheck are what's show in the diagram." 

Possibly a bug that's been around since probably Poser 3. Try opening another application, Notepad or Calculator, whatever Click in that window and then try going Back to the Poser export dialog. For some reason, those checkboxes sometimes won't accept the focus straight off. Surprised if they haven't fixed it.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken