facebook-like-page-locker-lite

Ok, this is a good plugin, it delivers what it promises. But there's a missing feature that I want, which is allowing to limit the amount of times it will show per session. I know this is not a dedicated popup plugin, it is a content locker. But it states that you can use it as a popup only too. So this feature should be in the plugin. I want to show it to every new user on my site that enters on any page, but only one time per session.