[eluser]jacobc[/eluser]
you can create them in the CI library directory...
I would tend to download the latest CI, and implement some libraries that I want to use in all my applications.
Then when you want to start a new app, instead of a fresh CI install... you use your CI + custom libraries instead.
If you have a server that hosts many of your apps, you might be able to do some symbolic linking to you own library folder that is used in all the apps.