Works when I use it – the first option for each of Primary, Secondary, and Extra on the Xtreme Plus Smart Menus tab. As I recall, this was in response to an earlier request, and that included a desire to have different labels on each menu (usually just the primary and secondary.)
Note – I did discover a fairly major bug in that quotation marks ended up escaped, and so you couldn’t add in classes or inline styling. That is fixed in the just released Weaver Xtreme Plus pluign.