Having the ability to select multiple layers and move them would be helpful. Even better if you could make a selection and then move everything from those selected layers within the selection.
edited September 2017
Yes PLEASE! I would love the ability to copy and paste the contents of entire frames across all layers to the computer's clipboard, so I can utilize my creations in other programs for assistance, too. Being able to copy across layers and paste them as a flat layer into another program would help immensely with work.