I've just had a thought, rather than use the style list for ul etc. Have you tried creating a HTML template in the FCK editor just for the ul list. - you could create a HTML template which has a ul and a class applied to that ul.
The user would only then have to edit the text in the ul rather than edit the source code.
This may be a way of getting around the problem. Have a look at this tutorial:
FCK Editor HTML TemplatesThanks,