An ident, any ident, will only be useful for identifying someone if they choose to let it. Obviously anyone who's looking to dodge a ban won't choose this and attempting to force the ident on them will make no difference whatsoever. It doesn't require a genius to stop the ident, and within an hour of release of something like this there would be a dozen webpages dedicated to telling people how to do it if they didn't already know. Anything on the client's end is ultimately controllable only by one person - the client.
