Dynamic User Defaults??

I have set-up a properties file using settings.bundle, but have a question for this group.

What if I want them to pick some setting / item using a multi-value field and that list of options is currently 10. It could become 11 tomorrow or even 12, or 13 different values...I don't know in advance.

I want to store info about the user in a manner similar to user defaults, but if I can't pull down that dynamic list from a web server to change that list of values, then maybe I need to abandon user settings and go with some form of in application settings.

Thoughts?

Thanks in advance,

newDeveloper