Start reading on targeting tracks or drag the audio to your desired track, instead of the video.
When you get the video portion of the clip positioned in the track you'd like, hold down the Shift key and then drag down into the audio track area. This will "pin" the video portion of the clip to the track you landed in, and then let you position the audio portion in whatever track you like.
You can do the reverse by positioning audio where you like it, holding Shift and dragging into the video tracks, and then position the video portion.
Colin, another good tip!
A little clumsy, but still a slick trick!
I've always done this in two steps...
A slight pain in the ***, indeed, but compared to FCP X, it's heaven!
I'll grant it's a bit goofy at first, but like so many things when it comes to editing--particularly as you get all Zen with your NLE software--it becomes pretty automatic.
Practice, practice, practice