You can open the pose file in a text editor (WordPad works fine). You will find that all morphs have their separate sections in the text, you will recognize the names from the dials. Just edit out the morphs that you don't want in the text file and re-save it. It might sound daunting at first to go into a file and mess around with it in a text editor, but once you looked at it and see that the structure is quite simple, it's very easy. The same goes for face and and hand poses, BTW.