I also did some quick tests and everything looks OK. For footnotes and endnotes it would be helpful, if the clip would replace _N_ with a number if a number was selected before the clip was applied.
For example, if I enter a 1, select it and apply an Endnote LI clip the result should be:
Code:
<li id="en1" epub:type="endnote">
<p>
<a href="HREF_FOR_RETURN_FROM_ENDNOTE#en1" epub:type="backlink" role="doc-backlink">[1]</a>
TEXT_OF_ENDNOTE_HERE
</p>
</li>