How do I enable thumbnails in PCManFM?

In the file manager PCManFM version 0.9.10 (in the Debian Wheezy repositories) thumbnails are generated for images but not for other file types such as PDFs and videos. Does this version of PCManFM have support for other thumbnails and if so, how do I enable it?

I have the PDF reader Evince installed and there is a PDF thumbnailer file in /usr/share/thumbnailers:

$ cat /usr/share/thumbnailers/evince.thumbnailer 
[Thumbnailer Entry]
TryExec=evince-thumbnailer
Exec=evince-thumbnailer -s %s %u %o
MimeType=application/pdf;application/x-bzpdf;application/x-gzpdf;application/x-xzpdf;application/postscript;application/x-bzpostscript;application/x-gzpostscript;image/x-eps;image/x-bzeps;image/x-gzeps;application/x-dvi;application/x-bzdvi;application/x-gzdvi;image/vnd.djvu;image/tiff;application/x-cbr;application/x-cbz;application/x-cb7;application/x-cbt;application/oxps;application/vnd.ms-xpsdocument;

Still, there are no thumbnails for PDFs in PCManFM.