I have an app that has been radically changed (Skitch) and I'd prefer to not see any of the updates that the developer has made available to that app on the App Store. I'm lazy and like to use the "update all" function. When I forget I don't want this app updates, I then have to delete the newly downloaded app, restore the old one from my backups, etc...
Can I go in and change the package receipt or something else to trick the App Store into thinking this app isn't a lower version of the current program?
I am looking for a Mac OS X solution and nothing to do with the iOS app store in case that's not clear. I'm also not concerned about hiding things in the purchased history - just that I want the older app to stay installed and have the system not want to feed it updates anymore.