You can get the extra functions keys working with
keyTouch. Because keyTouch doesn't support this keyboard yet, you will have to create a keyboard file for it. This is done easily by using
keytouch-editor. Documentation for keytouch-editor is found here: http://keytouch.sourceforge.net/keytouch_editor/
Send your keyboard file to marvinr(at)users(dot)sourceforge(dot)net so that other users do not have to create a keyboard file.