Why not just only apply updates when you feel like rebooting? That's what I do. I've lived without them my whole life, a few more days won't hurt anything. Of course, I also turn off the annoying packagekit app that is like an animated paperclip tapping on my screen saying: "Hey! There's updates! Don't you want to apply updates! Com'on, it will be fun! Let's go update the system! You don't have anything better to do".