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That would be a good idea. And if it was something that could not be done, a good suggestion to users if you are going to change your name is to put in your profile something like "Once known as XXXX"
I think its a very good idea. Maybe being able to have more than one Username per i.d. that way, like you changed yours BBW, it lets you have a bit of fun at certain times.
I changed mine earlier in the year and someone took MadMonkey straight away to teach me a lesson. Luckily they let me have it back though :o)