Thanks for your reply.
"Neither the name of pfSense nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission."
I see where you got that. Since I am not looking to modify or build upon pfSense, I wonder if it would be ok to leave it as-is, logo and name intact. Really, I would be making users more aware of the existence of the project, which I would think would be a good thing.
But on the other hand, people may get the wrong idea that I am an official representative or developer or something.
I see both sides, and will take your advice and wait for a core team member to give the final word or more clarification.