Qtcreator/qmake pro reference files

[blobfish]

Is it possible to add "reference" files to a pro file? if not, would it be beneficial to have this feature?

what I mean:
I have an api called foo. Foo has all the required header and library files, but the documentation is a pdf file and there is a sample.cpp file. "it would be nice"(there is the phrase!) if I could add these files to my project as references, so I could review these as I develop my project using foo. For example I could add the following to my pro file and have these files show up in my project explorer.

REFERENCES +=
PATH\doc.pdf
PATH\sample.cpp

Of course these would be left out of the build process. Any file that creator couldn't view could be passed to the system to launch associated program.

I think what I want could be achieved through sessions, but I have never warmed up to any session management in any system/application. Not to get off topic, but if I hear some praises of sessions within creator I will try again.