Does anyone now if it's possible to change the link under the "my gallery" button to
http://<coppermine-url>/?<username>
This is the feature requests board you posted in (where requests for features of future versions go), so I guess your question is "will you add such a feature in the future?".
The answer is "no, not inside the core code of coppermine, as it would require mod_rewrite, which is not available on all webservers". There are however way to accomplish this (although not that easily).
Joachim