The default Glossary offered by every HAT I've ever used
(HDK, Doc-to-Help, RoboHelp) since 1991 have usually been found
lacking, in one way or another. That led me to the easy way out,
which I continue to use today: create a topic called glossary.htm,
and link to it from a custom button in the toolbar as well as a
redirect page from the TOC.
As with browse sequences, drop-down text, expanding text,
etc., the pain is just not worth it when you consider the angst
caused by file corruption, WYSIWYG printing, and Printed
Documentation issues. It's amazing how delicious it feels when you
stop beating your head up against a brick wall! :-)
Good luck,
Leon