My policy on transformative works:
Translations - yes.
Podfic - yes. You are free to pod any of my fic, the audio format isn't my thing, but if you enjoyed my fic enough to want to pod it then feel free!
Repodding - yes. See above.
Sequels - no. Please do not write direct sequels to my works.
Remixes - yes.
Fanart - yes.
Basically, if my work sparks an inspiration for you then let the creative winds carry you, just don't try and 'finish' my works for me (with the exception of "Way Back" where I've given sequel permission in the fic itself).