Feature Request: Destroy frame on loss of focus

Love this tool, but would love it even more if it destroyed the frame when focus is lost. Certainly it's currently reasonable that bringing another window to front buries equake and puts focus to the window now on top. But to be most faithful to Quake-like dropdown windows, this should hide if I Alt-Tab away, or move to another workspace, etc.

I can't figure out how to properly respond to the focus-change events in emacs to implement this myself. I'm having a hard time reacting to the recursion that occurs if I destroy the window while the window loses focus.

I'd be happy to collaborate on this with someone.