Brit forwarded to me variations on the following questions asked by a few evaluators, so I thought I would post the answers Brit has given (and which I've given in the past) to these questions:
Can I skip faculties about which I don't know enough to evaluate? Yes
Can I just complete the specialy evaluations, rather than the overall evaluations? Yes
As I've noted in the past, "A good survey aggregates a lot of partial knowledge to give us a more complete picture. If any one individual could know as much as the 300 philosophers who complete the PGR surveys, then we could just ask that person, and be done. And, of course, in the absence of the PGR as a resource, that's what happens: students ask a couple of teachers, and that's the end of it. (And if your teachers are really "out of the loop" or in the grips of utterly idiosyncratic prejudices, then the student is really in trouble.)"
ADDENDUM: And many thanks to all those who have already begun filling out the surveys! Brit and I have been impressed by the strong and prompt response.