Several suggested improvements and additions:
*** Element inspector:**
1. When changing a object with a new one (choose), give option to bring new object in at its original pixel size.
2. Nice to have: Ink effects for objects (darker, lighter, multiply, etc.)
1. Freeform shape. This is especially important for creating buttons that do not overlap each other.
2. Button: When changing a button fill with an image, give option to bring new object in at its original pixel size.
Metrics inspector: Give option for simple flip horizontal & vertical of objects.