i own this theme Wp-Classipress. If you see the demo available in their website you can see that:
USER REGISTRATION and all user's related action are available from a USER PANEL integrated into the template.
I need to implement something similar for my own theme. I don't want to use PLUGINS, but i would like to extract this functionality from WP-CLASSIPRESS and move it into my theme.
The code to implement this must be clean and easly movable to all themes i want.