No, it's not.
Wrong. From a technical standpoint, it is NOT all that difficult to do this... but their POLICY is to not do it. However, I DO know people, who for various reasons Sony's bought into, have had customer support change their online ID.
So it seems that if you can come up with a good eough reaason, they MAY do this.
Contrary to popular belief, your online ID poses no security risk.
If you are concerned about your security then change your E-mail. The online ID is already public, the hackers won't "get" you if they know your online name.
no sadly you cant change ur online id
(i wish sony would let us do this...)
(i really want to change my email address thats on my profile here on playstation site... its annoying me that email is very old and is deleted already...) i really want to change these... ugh