For the record, the move of this option from preferences to the view menu *IS* fully documented in the Vegas 6.0b release notes. There's a lot of interesting information in there.
"I know, but the release notes aren't in the help file when I hit "F1" "
. . . maybe the release notes tell us that this information isn't in the F1 Help file either? No? Ah .. I got it! Maybe what we need is "release notes" on the release notes? Something like - "Don't hit F1 for release note information" . .. Don't yah just luv this stuff?