Currently, you can only change your forum nickname one time.
I think that this should be changed so that users will be able to get additional name changes. For example, some people who have been on Smogon for over 2 years want a new name, but have already used their name change in the first year. A possible solution to this would be to grant the users one name change every year.If you use up all of your name changes, you will be stuck with your final name; you will not be granted additional name changes.