#1. Usually some form of power control signal is routed through the entire IO ring, it doesn't come out of the chip through a pad. This is really weird. Read the documentation more carefully, I doubt you have to do anything other than adding this existing cell to the ring.
#2. Sounds like usual TSMC gibberish. Those terms mean nothing without context. In the context of IO cells, I *think* they might be referring to periphery IO vs area IO. Again, TSMC is really good at creating these gibberish terms.