Re: Using ClassiPress as a plugin or just subsection of a WPsite
Hi Ben-
ClassiPress is designed as a complete classified ads system and not a plugin. For your situation I would recommend implementing a new instance of WordPress and install the classipress theme there.
So referring to your example you'd put a new copy of
WP one level below your site at mydomain.com/marketplace and run the ad system separately.
Plugins are great for WordPress but classified ads are better kept separately especially when you have multiple categories, user accounts and a payment module. It just gets confusing and crowded when used with your existing WordPress instance. It's just much easier to maintain when it's separate.
Your custom request is doable but you'd have to do some minor changes to the code to allow all emails to be routed to agents instead of the anonymous ad poster. You could also go into the ad once it's placed and change the email address to you.
~David