The DL button shows up in the editor, but when you click it, you get a blank screen.
I noticed you said you were supporting up to v3.0.5 - does anyone know what changes have been made to the editor hooks since then?
While I'm at it, and I know this is a tough nut to crack, but ideally, the code we're aiming for should allow for multiple DT/DD pairs within one DL, and it looks the JS code for this wouldn't do that...
Good luck - great idea! If I figure something out, I'll share.