I'm seeing that when I have Autoselect turned off for all video tracks and one or more audio tracks Autoselected, and use Cmd-7 to open the TEW, I get an error message that "Target Track has nothing appropriate for trimming.
In the reverse situation, I can use Autoselect to iso a video track, hit Cmd-7, and the TEW opens with the nearest edit on that video track, as expected.
Of course, it does the same backwards thing as Match frame, where if you have 2 tracks autoselected, it opens the edit on the lowest one, not the highest one as one might expect.
--Ralph