The updated Photo Gallery allows you to do many of the things you have been asking for in a Photo Gallery. You can now “batch upload” – this means you can select one or many images to upload at one time. You can now drag and drop the images in the Photo Gallery to rearrange them. It is now possible for you to select what image will be the avatar for your Photo Gallery.
The Photo Gallery has a new look too. Instead of the grid pattern of the old gallery, the new gallery will display your images in a montage format. You can still get the grid look by making all your images the same size before you upload them into the gallery.
For complete documentation on using the updated Photo Gallery get the PDF here.