And it indeed works!
In case you encounter somebody else who is using the node twitter module, the proper use, once your app has been set up, looks like:
var params = {
'include_email' : true
};
twitter.verifyCredentials(accessToken, accessSecret, params, function(err, user)....
The module takes the dict passed in the third parameter and adds it appropriately, or ignores it if there are only 3 params.
Thanks again!