I don't know about scrubbing ISOs, does it mean the same as 'trimming' maybe? You can trim/shrink files with JHexTool to, say, shrink a 128 KB file to 64 KB. Load up a file and enter the desired file size in the padder panel, e.g 64 KB and click Pad and a .pad file with exactly that size will be created.
Dumping in the context of JHexTool means to print the bytes of a file to a text file so it can be viewed in a text editor. In combination with the padding, I find it extremely helpful for savegame hacking, which was the main reason for creating this tool. Glad to hear that you find it useful, too!