I'm using pinax, and using the idios which is the default profile apps for user profile. However, I don't know how to add my own logic. I know I can customize my own model, but the document seems too naive for me. Is there any method to extend idios, for example I want to add a hidden field in module, but I don't know how to change its value when submit the form. Also how can I add gravatar to idios?
Thank you.