TOC and dialogue/drama/poetry

The elements dialogue/drama/poetry have an optional <title/>, but this does
not generate to the Table of Contents. Where does one start to add this
functionality? Using <section/> generates to the ToC as desired, but this
adds unneccesary bulk.
The following is the xml I am working with:

<chapter><title>Poems</title>
<poetry><title>Repeated Numerous Times</title>
<linegroup>
<line>text</line>
</linegroup>
</poetry>
</chapter>

~ Paul