I just called Synergistic Research customer service regarding the original question; the answer is the second option. Leave the low-frequency part jumper cables out of binding posts and may do something to prevent shorts.
The IFT bi-wiring method seems to be a very clever idea from Synergistic Research in that it accomodates single wired speakers, too.
The IFT bi-wiring method seems to be a very clever idea from Synergistic Research in that it accomodates single wired speakers, too.