Good Morning B-Lunist.
Thank you for your inquiry. AGORACOM does not allow members to change their usernames after a certain period of time.
In stead if one wishes to post using another alias, they create a new profile and their previous account is barred from access.
With regards to showing IP addresses on our public boards, we wouldn't be able to provide this information as it would be in violation to our privacy policy.
Thanks again for your inquiry and your contributions within the AGORACOM community.
Kind Regards,
AGORACOM