Okay ppls, I've finally started coding on it, got some cool JS to go along with it. Anyhow, I have the back-end almost done, now I gotta make some post meta boxes for authors and administrators along with a few security measures to prevent workarounds.
One added feature that I failed to realize it needed was to give a drop down menu for the Enter and Exit pages so admins can select a page if necessary. I will be leaving the URL text boxes also so you can use a custom url if you wish. But you will have three radio buttons per box now so you will have to select rather you want to use a URL, Page, or none (just let the user view the site).
Due to restrictions placed upon cookies by their respective browsers, I have set it up whereas you have to have the cookie expire no less than 24 hours (1 Day). If you set it to (Days, Weeks, Months, or Years) and set the value to zero (0) the cookie will expire once the user closes the browser.
I'm also working on the wpmode workaround for those of you who need it, you will have to enable it via the Admin panel however.