Under Additional Filters in modifying the Content Query Web Part (CQWP),
is there a way of adding a custom option to the Drop-down besides the
OOB ones like:

* <no filter>

* Approval Status

* Checked out User

* Content Type

* Created

* Created By

etc etc .....

The problem I have is, I have CQWP on the Home page of a site. I've
configured the Query and selected the option "Show items from the
following site and all subsites". The Query works fine with the default
options listed above. I want to know whether the Query can only return
the latest uploaded documents to any document under that site.

If you know any resource online that can direct me to the right path
then pls let me know.