According to my understanding of WP Rules, plugins are supposed to be fully functional as a free version. Your plugin has multiple items in the list of options for the contact form, but only three are functional for the free version. I believe this plugin should be removed from the Repository for violation of rules.
The Repository isn't supposed to be used as a baiting platform.
I don't mind you having your link in the dashboard menu. But placing items in the options and greying them out in the version that is in the repository is just plain wrong.. I took your advice that you have given others who gave you one star, and gave you a chance.. Seeing your tactic, I deleted the plugin.. NO GO..