Envoyé de mon iPad
Head desk and facepalm at the same time...
Cyril
For a while, Kensington made a car charge that came with a detachable USB dock cable that had a pass-through dock port. It was the "Kensington K33368 4-in-1 Car Charger." According to http://www.touchcentric.com/blog/archives/123, that cable worked for debugging while the VGA adapter was connected. The car charger's long-discontinued, but you can still find them on ebay.
I'd be thinking about grabbing one the next time I need to do some video-out work, but I'll check out the dockStubz approach, too.
--Eric