Searching for pdf files

Can Devonagent be setup to search only for pdf files? (i.e. by the extension .pdf)
The document scan is useful, but I’d like to narrow my searches further due to the number of false positives (i.e. searching for an author and 90 instances of bookstores selling their book come up).
Thanks for any assistance you can provide,

DEVONagent supports only (X)HTML and RSS/RDF/RSD/Atom feeds right now but support for more filetypes will come. The only workaround right now is to use the Documents scanner which will return only pages matching the term AND containing links to documents (PDF, RTF, Word etc.).