I am trying to use hook_form_alter() to hide the input format selection fields on CCK text areas for some of my users, but I have yet to find a way of doing this that didn't also disable my WYSIWYG editor on the field. Can you provide a documented method for achieving this? The need to hide these options is not uncommon.
For instance, what if WYSIWYG recognized that $form['field_page_body']['format']['#type']='hidden' and $form['field_page_body']['format']['#value']=3. Then it could just assume it should use input format 3 for the field_page_body text area and not try to attach anything to the radio buttons. That would allow me to unset everything else in that variable.