Not sure if this is a bug or feature request, I'm on 1.4.0.0.
When you hit the ESC key from the main UI the application exits. If you've unsaved changes it does prompt to save prior to exiting, which is great, however exiting an application from hitting ESC isn't really in keeping with the Windows application UX. Otherwise it is handy to use ESC for dialog boxes, for example to break out of Search Products, email opts etc where it works as expected.
Hey Steven, this feature shipped today in build 1.4.3 https://patchmypc.com/publishing-service-setup-documentation. Note: 1.4.3 isn't posted via self-update yet because it's a big update with the new application management feature, so it's shipping in stages. You can download and upgrade using the URL above.