I give blanket permission for any and all transformations of my work -- translations, podcasts, audiobooks, illustrations, remixes, roleplay, etc. You don't need to ask my permission beforehand. I would like it if you linked back to the original story, and it would give me a nice warm feeling if you contacted me afterwards to show me where I can see your work.
I also give blanket permission for any sort of critique or commentary, private or public, positive or negative. Basically I just like the attention.