What's actually on the Apple OEM 1- and 2-slot PCI risers, anything?

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Nope, it's a Passive Backplane Extender/RA adapter board in all the P6360 based PCI MoBos.

Could it be as simple (hah!) as putting a generic 3-slot riser in there and disabling/re-routing the Comm slot?

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HRMMM . . . depends . . . if the empty COMM Slot shows up as a PCI Device in SlotInfo, that'd be a no, AFAIK. If it DOESN'T show up (not bloody likely as the PCI addressing info is on the card as opposed to on the MoBo for NuBus) and it's a "Pseudo Slot" address, there might be some hope.

IIRC the PCI controllers in question (as were most) were 3 slot/address limited. I'll dig through my boxes for my copy of DC&DftMFH when I get a chance, I'm pretty sure it covers PCI Cards & Drivers.

Interesting topic! }