How do I tell Br to tell Ai to keep the original document dimensions for batch Live Tracing?

Wow, I actually managed to get that question down to the allotted space given.

I need to turn a batch of PNGs to AIs for an InDesign document.  They're prepped and ready to be traced, but it would save time if I didn't have to go into every document manually after live tracing to reduce the artboard sizes to the artwork bounds.  Is there a setting or a script that can do this either in Illustrator or Bridge?

I assume this has been answered by someone before.