It's not possibile add notes about web site developer, as usually happens in many websites.
I would have added also the option to insert text linkable
Thanks for identifying this! This was happening in Joomla 1.6 / 1.7 because of HTML filtering on the copyright text area. We have released version 1.0.7, which specifies the format as raw. Any HTML will now be allowed.
P.S. Next time you have an issue, please ask for help on our forums or via our contact form. We can respond to your problem much more quickly that way!