There is also a script for LJ where it's almost like yours. I'm just showing to show that there is a demand for it. Sadly it hasn't been developed in years but people still want it. http://dtm.livejournal.com/26478.html

Since your script is FF only, I'll have to test it later. Thanks in advance for this and good luck.

Oh, can I talk about this on tumblr? A lot follow the Ao3 tag. They could test it too.