IMHO, its a good kit. Most of the suggestions I've read in this thread are matters of personal preference, and I think we all have a tendency to tinker with these kits.

As far as adding anything, I think I would focus on the most likely emergencies I might encounter in my life (for example, being stranded in my car in severe winter weather), and put in some small piece of light gear that would be helpful for that.

Or a candy bar.