Thoughts on how/where to override apiUrlBase, authorizeUrl, accessTokenUrl?

Craig,

When developing my own API, it would be nice to have the ability to override the values for apiUrlBase, authorizeUrl and accessTokenUrl. In the current examples, all of these values are hard coded. While I think this is fine for defaults, I'd like the ability to override those values so that I can test future API changes/additions in another environment.

Any thoughts on a good place for this type of functionality/logic to exist?