I'm not sure if this is possible.
But I use a front end posting plugin called access press anonymous pro which allows users to create posts from the front end of the site. I would like functionality added to it that allows me to limit the number of times a member can post, and be able to set this time to whatever I want. For example User can only post once in 24hrs, then the form is disabled. I want the limit to be done via user username and also IP address.
Also I use this plugin on several sites, so I would this add on to be in the form of a plugin i can install easily on my other sites.
Please note my site is ADULT related.