Second Monitor! How?

I am a frequent user of Final Cut Pro X and have my 'viewer window' on my 17" secondary display and the rest of my editing windows on my 27" iMac.

It would be so nice to have the 3D or Perspective display on my secondary display.

The 'Multiple Monitor Support' thread on 'Wish List', looked highly relevant and it seems from Somian's post

"I'm joyfully using cheetah 3D here and I usually use it with two monitors. One for the render window and one for basically everything else"

that such is already possible.

What am I missing or do I ask Somian directly?