The current configuration approach varies:

• Some configuration options may only be set in the URI; e.g. sockettimeoutms
• Some configuration options may only be set via code; e.g. SSL options
• Some configuration options may be set either way: e.g. appname, minimum pool size

Do you have a sense for which of these models will be more common in the future?

Do you expect that options for a pool will always remain a superset of the options for a client?