Granular controls for scaling and positioning image crop

[theelectricmayhem]

First off, your tool is outstanding! I use it constantly. :)

In using your tool, I've found that the scale and positioning of the image crop is a critical aspect if you want to get a good mosaic result at the end. The current problem is that the controls are just click-and-drag, so you can't precisely position the bounding box. It would be incredibly helpful to have control over the exact positioning and sizing.