Regarding the tablet tag I can see now that you do not have it in the new documentation.
However I hope that it still works if you update an old tour.
Right, the <tablet> element is not explicitly documented, but it will be still supported of course.
My intention is that old panos or tours always should be upward-compatible - that isn't possible always of course, but I'm trying to make it that way as good as possible.
Best regards,
Klaus