WHERE IS THE COPY PASTE!!!

To be able to copy/paste from one board to the next would be a HUGE time saver!!! I work in .AI, Photoshop, Sketchup and use copy/paste often. At the moment I have one design in sketch up but am looking to pull certain elements from other boards. Unfortunately it's taken me an hour to do this where copy/paste would have take 5 seconds. ALSO being able to undo work multiple times instead of just once would be another huge time saver. I like this program but find myself redoing work time and time again because it's lacking these features. ALSO- if there would be a feature to tweak colors I wouldn't have to bring images in and out of photoshop to adjust slightly. Improvements are needed desperately!