I see nothing of the kind in Epson Scan. Perhaps you were thinking of SilverFast. If so, I would recommend putting the slides into the slide frame holder (if they are mounted) or onto the Fluid Mount Accessory glass if they are not), then using the SilverFast "Find Frames" tool to frame each of the slides, then you can call up each one to crop to suit (this is always a manual process as it depends on what cropping you want, differing for each photo). Then open them into the Batch Scan tool, which will scan them one after another retaining your crops and any other collective or individual settings you have made in SilverFast.