From my own experience with those kinds of plugins, I don't believe they are that specific in terms of functions within a plugin or theme. i.e. If it does happen that you can allow access to only the ClassiPress admin panel, I don't think you can restrict them further to see only certain pages of that admin.
These plugins work great for giving more control than the standard
WP roles, but I'm not so sure that it would work for your specific requirements in this case.