- I select a shape from the palette
- I click and drag to draw my shape on the canvas
- I realize I didn't start at the right spot, but I don't want to have to start from the beginning
At this point Adobe apps allow me to hit the spacebar, which causes any further dragging to reposition the existing shape (at its current size) as I drag. When I lift up the spacebar, I can continue sizing my shape from its new origin.
For reference: http://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html
It's a seemingly minor function, but very useful, and notable in its absence here.
(AD's existing Control-drag is interesting, but not the same.)