NBC's 'Chuck': a return for Summer Glau?

We have already seen both Isaiah Mustafa and Stacy Keibler reprise their roles on "Chuck" from earlier this season -- so could someone else be next? When you think of past "Greta" characters who are popular, the name "Summer Glau" immediately rises to the top for a number of reasons:

Glau's propensity for being a TV action queen.
The "Firefly" implications of pairing her with Adam Baldwin
The fact that she can make a killer impression (in so many ways) in just a matter of seconds.
She has NBC connections, and with "The Cape's" cancellation she could be open.
So could anything come out of this idea? Speaking about the idea to Entertainment Weekly, executive producer Chris Fedak says he would do it in a second -- at least so long as he could find a way to bring her character back into the story realistically after what went down last time:

“I would love to bring Summer Glau back. She, of course, left on bad terms at the end of her episode. She had kind of run afoul of Col. John Casey, but, listen, if we have the opportunity, I would love to bring summer Glau back. She’s just wonderful.”

Even though some other former "Firefly" stars have permanent gigs, who do you want to see appear on "Chuck" the most moving forward?