Originally Posted by Valloric
Currently, you have to use the heading tags since the original NCX file is not preserved. Original NCX preservation is a planned feature
I'm sure there's a way around this but the restriction creating TOC entries from heading tags is extremely inconvenient: it changes fonts I don't want changed; I want to link to images which have no text associated with them; I want to use different text to the actual header (yes i can edit the ncx directly but it's a pain). At worst i'd like a nice little 'Insert TOC Entry' with a dialog to label the entry.