At Admin Panel -> Settings -> Switches, the "bulk submit" switch (currently only in WSN Gallery) allows submitting a bunch of images at once which each become a separate topic. When the switch is on, you can configure the permission by usergroup at Admin Panel -> Members -> Manage Usergroups. You can set the number of images at a time that can be bulk uploaded at Admin Panel -> Topics -> Topic Settings.

To do a bulk submission, simply click the bulk submit link in the actions box on the front page or in a forum. The uploads will be processed through the bulk uploader, which will need to be switched on as well. Each topic will be auto-titled based on the file name and will go to the forum you've selected.