Yes, adding another pressure row by manipulating the P values is a neat idea... I have thought about just throwing out P1 by shifting all the P rows down one since nothing EVER seems to get logged in there on my car anyhow. This would give me more resolution in the range that I actually USE. If you aren't using P1 for anything ever, it's basically a waste to have it there at all. The only thing I can think of that's good about it is that if you are in row P2, or on the "low side" of P2, the PFC can look at P1 to make an intelligent decision on how much fuel and timing to use via interpolation between P1 and P2.

Brian