Will mongooplog tool work against servers that require authentication?

Ive been trying to use the mongooplog tool to replay operations from a live running replica set we have into a local db.

However it keeps failing with:

Wed Sep 5 07:39:27 creating new connection to:127.0.0.1:27017
Wed Sep 5 07:39:27 BackgroundJob starting: ConnectBG
Wed Sep 5 07:39:27 connected connection!
connected to: 127.0.0.1
Wed Sep 5 07:39:27 [oplogreplay] going to connect
Wed Sep 5 07:39:27 BackgroundJob starting: ConnectBG
Wed Sep 5 07:39:27 [oplogreplay] connected
Wed Sep 5 07:39:27 [oplogreplay] starting from Sep 4 07:39:27:0
Wed Sep 5 07:39:27 [oplogreplay] repl: local.oplog.rs.find({ ts:

{ $gte: new Date(5784331245513080832) }

})
Wed Sep 5 07:39:27 [oplogreplay]

{ $err: "unauthorized db:local ns:local.oplog.rs lock type:0 client:80.169.144.162", code: 10057 }

Wed Sep 5 07:39:27 [oplogreplay] error getting oplog
Wed Sep 5 07:39:27 [oplogreplay]

{ $err: "unauthorized db:local ns:local.oplog.rs lock type:0 client:80.169.144.162", code: 10057 }

I then realised looking back at the documentation for mongooplog (http://docs.mongodb.org/manual/reference/mongooplog/) that

If the mongod instance specified by the --from argument is running with authentication, then mongooplog will not be able to copy oplog entries.

Firstly just to be sure: is this the reason why its failing for me?

Secondly is this likely to be changed in the future? so that you can use it against a mongod instance that requires authentication?

Thanks
Nadeem