I was hoping that I could place multiblock panels in the same block as busses and terminals, but no. Could these be edited so they are considered like that?

This requires a hard dependency on FMP. No. Or well, I expect that's the answer you will get.

No.

I talked to CB about this: Chicken-Bones/ForgeMultipart#194 (I have no idea how multiparts/multiblocks work, I'm not a severe coder) and it does have do be done on your end. Please consider some of this happening, maybe even for other blocks.