The two you named are the most important in my opinion.
The customs one especially in the event that a buyer leaves neg. for having to pay customs fee's. Ebay will remove their feedback. As long as that is stated in your listing somewhere.
I know some use this item has not been tested for lead and phylates but I consider "All items are sold as collectibles for adult use and should not be given to children" just as good. And technically by law you have to state something along those lines for any vintage toy.
I would make it clear on when payment is expected and clear shipping details, including what your combined shipping rule maybe. And I would make my return policy clear, as in do you accept returns??, who pays shipping back etc. I would also state what your handling time is. It saves time in the long run if your buyer has questions.
Here is the link to ebay's newest seller update so you have an idea on what to expect with some of their newest changes.
http://announcements.ebay.com/2012/07/fall-2012-seller-update/