Crop tool and image fill options

Is there a way you can control the pixels or snap to a component when you are moving an image in crop mode? for example moving an image down by 20px within a crop, which shows you the dimensions.

Would also be nice to see the name of the image fill on selection. as all fill images are shown as just (image) very difficult if you are updating a document with 100s of variants, would be great for (Image_name123)