I find IV usefull for batch cropping of images. However, there is a hatch. You have to remember the coordinates and the resulting size,even if the Custom Crop dialog box was used to find the correct size and coords.

And since it is four separate input boxes, it's no way to copy/paste from Custom Crop and into Batch/Advanced/Crop dialog box.

I suggest that a new button is added to the Batch/Advanced/Crop dialog box to activate the Custom Crop dialog box so that the user can decide the coordinates and size from there.
The Batch/Advanced/Crop dialog box must be hidden when the user is selecting coords/size so the picture with selection is visible for the user.