I just did a quick bit of googling and came across this post (in the Gallery Yahoo group I just mentioned in your other thread) which suggests that there is/was a "bulk upload" module. I followed the link to the module page but couldn't see any mention of a "bulk upload" module. Perhaps he meant the html5 upload module? Perhaps if you ask in the Yahoo group someone might be able to help you?

If you find a solution please post back as other future users may also be interested.