Is it possible to modify the mongo_client parameters that meteor uses?

In short, with say Python, I can do: 

client.write_concern = { 'w': 1, 'j': True, 'fsync': True }

in order to:

  1. Set mongo client to provides acknowledgement of writes on a standalone box
  2. Confirm that the mongod instance has written the data to the on-disk journal
  3. Force the database to fsync all files before returning

But I don't see anyway to do this with Meteor. Is there a way?

I think it already does this by default:

If you see the package https://github.com/meteor/meteor/blob/master/packages/mongo-livedata/mongo_driver.js

Safe is enabled (which is to get acknowledgment of writes)

var options = {db: {safe: true}};