I am applying for junior faculty positions at research universities. Most job postings request three references (either just names and contact details, or actual letters of recommendation), and I've already secured these from the three full professors who can best attest, in different aspects, to my research and teaching skills. One of these professors was my thesis advisor, and the other two are faculty at other universities with whom I have worked closely.
A few job postings ask for five references. Now, I could approach two further senior academics who could also vouch for my research and teaching abilities, though there's no one I have worked with nearly as closely or as recently as my three top references. I have no doubt that they could supply positive references, and while their names alone might carry some weight, they wouldn't be able to write about me in as much detail.
On the other hand, I do have some notable collaborations with professors on work other than research and teaching—namely, on outreach and knowledge transfer activities. That is, we have cooperated on projects aimed at disseminating scientific knowledge and research results (not necessarily our own) to the general public and/or industry. Would getting a reference from one of these professors be of benefit for a faculty application? Or would most selection committees be looking exclusively for research and teaching references?