Yeah I like it, a short time ago I made a suggestion for stats to not be saved and it was rejected, so I sometimes play with unregistered nicks, but having the option to hide your stats and make them private so only you can see them, is a good idea.
However this won't prevent stats-maniacs from ganging 4 vs 1, killing only new players etc. because they will still be able to see their own stats and to make them public for everyone to see them.