(Gently bump) Yes, we are in need of that, too. I guess its mainly playing with CSS files - but like you I don't know (yet?) whether this has to be in the theme or any other place.
It should be something along these lines (default theme)
#link__wiz_result {
width: 600px;
height: 400px;
}
But then I dont know whether any JS is involved, too.