In addition to the rotate and scale slider bar it would be nice to also have the option to double click on an image, text, and be able to easily pull or push the image into the size wanted, adding the option to use shift in order to keep the image proportionate would be good also. A triple click would bring up a little circle indicating that one could now rotate:).
These options are just second nature to me since I am coming into this program, I am very impressed with by the way, from many years of working with Corel, Xara, Adobe, and others.