I've downloaded the 0.3.5 version and I discover than now create TOC
But there is a problem that I resolve with Sigil.
When I try to open the ePub file,
Adobe Digital Editions crash when I try to open the file, and other readers like
Barnes & Noble eReader tell me "File not found", and
Lucidor open the ePub but don't show the TOC and the cover.
When I open the ePub with Sigil, I don't see the cover. I see this:

This is the bad code:
<div><img width="51%;" alt="" src="../images/img0001.jpg" /></div>
Now I delete the bad cover and insert it with Sigil. This is the code that Sigil insert (works fine):
<div class="sgc-5">
<img src="../images/img0002.jpg" /><br />
</div>
Sigil detect the TOC!

There is not an important problem. Only affect to the cover and don't work with eReaders, but I report this for future fix.
I've used a Test Book for this, and I upload it for your inspection (70 KB):
- Original in ODT format
- ePub from Writer2epub
- ePub reapaired with Sigil
Download here
- I'm using OpenOffice 3.2.1 in Mac OS X Snow Leopard.