In the image editor, it seems the 'flip' and 'mirror' buttons do not work. Also I do not like how it adds your clipboard as a brush, since the colors get all mixed up and are all wrong. The rotate function doesn't really work, it allows me to rotate my selection however no way to confirm the rotation except copying it to the clipboard and adding it as a brush (and again, messes up the colour). There's no 'right click > flip horizontal/vertical', which would be nice. A CTRL+T selected area to bring up nodes to drag/stretch the selection and rotate, much like Photoshop, would also make things much easier.