URL Query Parameter Expansion for OAuth2.0 Client

[kbarnesMCC]

Following from #345, it'd be useful if we could get the ability to have a few additional URL query parameters to allow for specifying the new fields dynamically at URL team.

The rationale behind this, we use containerization for our local development ecosystem and per #622 we're unable to pass a formal configuration; though looking at that PR I'm not even sure support was added for such configuration.