I'm pretty sure the answer to this would be no.
This is as close as you're going to get:
You'll need to download Adobe Air.
Props to the author, @frogonmobile :)
Yeah, I think Kosso's right. I'd be very surprised if that were possible because of the way the interface's are built in Titanium. Apps do use native controls when they hit the simulator and device, but they're created and referenced via Titanium objects.
Seems possible. I'm developing a Ti UI builder app to help speed up interface development. Not released yet.