Nope, we will not be offering Kickstarter Exclusive Badges for YaoiCon outside of yaoi Kickstarter campaigns. However, future (if this one succeeds) yaoi kickstarters will also offer Kickstarter Exclusive Badges.
The same rules apply as YaoiCon's. Badges are valid for a 1 year roll over (2016) if it's registered and not used. You still have to register your badge, regardless if you attend or not to be able to ask for a roll over.
Unfortunately, we have no control over shipping prices as that's predetermined by the shipping carriers. However, the most affordable and cost efficient for international backers would be tier $100, as shipping is roughly only $4-5 a book.
Don't see the answer to your question? Ask the project creator directly.