You can open multiple ImageBrowser windows, each showing a different folder. Each window is completely independent.
You can drag files or folders from the File List in one window to the File List in another window and the items will be moved from the source folder to the destination folder. Holding down the Command key while dragging will copy the files rather than moving them.
Double-clicking and image file will open the image in a separate image-view window. You can open as many images as you like in separate windows. All the file viewing options like rotate and zoom work in these windows also.