I think Ulf removed it completely.
I really liked that feature in the latest builds before beta 4. It was just great like it was (for me anyway).
He may put the pref back in again if an overall solution can't be found.
I hope he does add it (again). Who can/will tell him? He doesn't seem to get my mails and I'm no dev-list poster. Switching between the way it is now (beta 4) and like it was before (dec 1/2) would be great.
I really think of getting back to the dec 1/2 build, as I'm just like thinking <censored> on every new window that I open...