Are the install instructions in the very first post completely working and functional for version 2.2.1 now, too? I'd very much like this hack, but if there are still issues to be worked out for version 2.2.1 (or lower, but I'm already up-to-date..) I think I'll wait until they're all ironed out
Great hack regardless, an attachment viewer and remove function was what I have been missing in that Admin panel all along...