Improved Move Tools
The copy/paste tool is really useful and although it seems simple at first, after working with it for a while - and doing some lateral thinking - it actually enables a huge amount of labour saving functions. I recently discovered I could copy/paste between projects - which is great when splitting an animation across several projects.
One thing that would improve it though would be a more accurate method of placement when moving a selected area around. The ability to lock movement to the x or y axis and a function whereby one could nudge the selected part of a drawing a single pixel at a time would be superb.
There is a tool that does this in Autodesk Sketchbook, and I find it invaluable, as accurate alignment using the stylus on the screen is almost impossible to achieve.