Yes, PW has /etc/upstart/ and I put the file there, but I didn't restart - whoops! It works now! Comics display full-screen, and deleting works. Thanks!
Now for a "real" bug report: the touch regions for comic reading are too narrow. They use the full height of the screen but not the full width (i.e. the right zoom button is about 3/4 of the way along the bottom, and the next page zone ends there). The comic page itself displays full-width.