I am wondering if there is a way to do an app, or have a patch/tweak that would allow custom tags for phone numbers in Contacts. So instead of having to choose from Home, Work, Mobile, Fax, Other, I could create my own such as "Hotline", "Vacation House" etc and tag numbers with them.

Does anyone know if a homebrew app already exists for this, or if it is even possible to do w/ a custom app or tweak?