By default, ClassiPress requires the user to register before they can post an ad, so if you were wanting to bypass or change the existing method this would certainly require customization on your part. Our themes are not encrypted, so you are free to modify them as you wish, and whilst we do not offer customization services, we do have a
certified partners page where you can find developers for hire who are experienced at working with our themes. When a new account is created, yes they do receive a confirmation email and you can choose whether or not you allow them to create their own password.
Yes, you could add other ad spaces aside from those already available through
customization or use of plugins such as
this or
this available in the AppThemes marketplace. Thanks.