That will help but its something I would consider as another layer of security and not something I would rely on. As far as the version number any software maker that has this in the footer is quite frankly asking to get their software hacked. This was removed from phpBB a few years ago, they even allow you to change the copyright text to an image if you wish so the "powered by phpBB" string is not searchable. That's not going to prevent someone from searching for a string in the URL that might be common to it or even common to a particular modification.
On the other hand if the stock install has this you may be able to fly under the radar of a lot of hackers.