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this means that for example the following code
var shell = createCom("WScript.Shell");
var path = shell.ExpandEnvironmentStrings("%PATH%");
fails with a "Jint.JintException: Method isn't defined: ExpandEnvironmentStrings" exception (createCom is a custom function which creates a COM object via ProgID).
I already wrote some code which retrieves the MemberInfos of a COM object and exposes it to Jint via a JsComInstance wrapper object (hooked into Marshaller.MarshalClrValue). If you're interested I can commit my changes (when their cleaned up) to my fork and
send you a pull request.