I've tried googling a bit, but can't find any such system. The only thing made by someone nicknamed Mog is a menu script.
If you give a screenshot/screenshots, or post the script for the MOG-pictures Gallery system you refer to, it will give more details as to what you desire, and what people here can do for you.
I'm not a script writer, but am fairly competent using events, variables and switches. If I can help in that way, I certainly will take a look. For what you describe, though, adding a button to your main menu, I think you'll require a script.