Hi luizsilva,
You make a good point, we actually hadn't considered exposing the 'Reverse Engineer Code First' functionality at the command line but I can see why it would be useful.
Can you open up a request in the issue tracker for this feature - http://entityframework.codeplex.com/WorkItem/Create. You could also open a separate request for restricting the table list.
Just to set expectations, I don't think we will have time to tackle these in the EF6 release.
~Rowan