I grant default permission to podfic my work, as well as any other transformative works. This includes using any AUs I may invent. No asking for permission needed; go ahead, have fun.
At this time, due to some particular anxiety issues, I don't respond to comments left here unless they contain a specific question. I understand that many people have policies of not leaving comments for an author who does not respond; I completely respect that and encourage you to do whatever makes you most comfortable. This is my anxiety problem, not yours. :)