Yup, this is already a thing on Mahz's to do list, though it's a little complicated to make it so you can "delete" the conversation from your side but not remove it for any other participants. However, Mahz [url=http://www.roleplayerguild.com/topics/4654/posts/ooc]gave an outline of his ideas[/url] for a system to make it work, so it'll be a feature at some point in the future.