FPP supports 1/8 scan on 32x16 panels and 1/16 scan on 32x32, 64x32, and 64x64 panels, although the 64x64 I have seen are actually two 64x32 panels in the same frame with dual two sets of inputs and outputs.
cant to just tell FPP your p5 panels are two p10 panels ?
Talking about P5 vs P10 in this context is like saying that you use 8mm LED's in your display, it means almost nothing. The '5' and '10' are just physical measurements, they have nothing to do with the actual input signal which uses a HUB75 interface. You then have to know what scan rate the panels are using. There are 1/4, 1/8, 1/16, and now 1/32 scan rate panels. The libraries that FPP uses only support 1/8 and 1/16 scan rate, although I am working on creating a new pair of channel outputs which can directly drive the commercial receiver boards that businesses use to drive these panels. Once this code is added to FPP, FPP will be able to support all of the scan rates since the scan rate will be handled by the dedicated receiver board and not a general-purpose Pi or BBB computer.