Making Calls to Existing Services, or Expanding Returned Fields

Hey There,
I've been able to successfully use REST Server to return both json and yaml for nodes. However, the feed that is provided back only contains a small subset of the total fields that make up a single node in my drupal installation. I was wondering how I can access these extra fields through REST Server. If I use the normal services commands like node.get, I get the entirety of the information contained in a node, however with rest/node/1 I only get a small subset of the fields.
My Questions are:
Is there something I need to change in node_resources?
do I need to configure my query differently?
How can I call existing services like system.connect or node.get directly?

-Rahul