In the next release it will be possible to configure it to include GreyBox on every page by setting IncludeGreyBox=true on the <ScriptLoader control in layout.master.
I'm also thinking of moving the /ImageGallery and /FolderGalleries folders below the /media folder to make it easy to browse images from the editor image browser. However, this will be tricky due to backward compatibility issues for existing galleries.
Best,
Joe