Just want to make sure I understand this before calling the RTW desk for my latest itinerary change.

So if I'm buying a seventh segment in North America, as long as its the last segment before I go JFK-HKG I'm ok?

This might actually work out ok if I'm to take the BOS-JFK puddle jumper before that flight. While RTs are now in the $120 range, would be safer to have a segment I could move without restriction if needed.