I've got a few questions on JAL explorer pass. The first two I can't see anything in the terms, but just wanted to check from people experience.

1 - is it possible to book multiple JAL explorer tickets for a single holiday in Japan? Is there any advantage to booking a multi-city over multiple one-ways?
2 - can you book the same route twice (e.g. HND - KIX)? I've read on the forum you can't but can't see anything on JAL website prohibiting it - is this an old yokoso condition?
3 - if you book a multi-city with say 3 flights include and you miss the first flight, are the remaining 2 still valid. I believe so as the terms say "Abandon for unused flight coupon is permitted", but wanted to check what this actually means as I normally fly BA so never seen that wording before.

Thanks - Barney