I'll try e-mailing scirra..
Being able to change your nickname would be a neat feature in my opinion. :] Maybe making it able to do it eg only every 2 months or something like that..
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at the moment there is not since the nickname is based on the registration name.... its not a 2ndary public name as on regular forums where you have account name and forum name.. which are different. here you only have account name which acts as forum name as well.
maybe after C3 release Tom will have time for the forum interface also.