Not wishing to be a pedant, but what these anonymous other individuals are doing is not profiling papers, but relinearising curves. For an existing curve, they are using Roy Harrington's relinearisation droplet and an i1 to straighten the curve (so to speak), and for a paper without a curve, they are taking the curve from a similar paper and relinearising it for the paper in question using the droplet. Sometimes a similar paper is hard to find, and so a range of possible curves have to be measured in order to find the best match.
The challenge for producing P2 curves c.f. K7 is that one K7 curve is produced for all five inksets, whereas separate P2 curves are produced for each of the five inksets, so it's a more time consuming task. If a custom K7 curve is created, then the curve is labelled as being for that particular inkset, but so far, the general release K7 curves are generic.
I've queried Jon about additonal P2 curves in the past, and IIRC he indicated that they intended to broaden the set, but that other things had higher priority, top of the list being this 1430 digital negative system, I assume. There are a couple of surprising omissions from the P2 curves, such as EEM and IGFS. Probably Platine as well.
p.s. It would be useful to get an update on the state of plans for more P2 curves, once the 1430 digital negative system is out of the way.