Sriram,
Sorry for the delay. I wanted to think a bit more about what you were requesting before I responded. Unfortunately, that's not something that's easily done with the SCLogin module. The menu items themselves have no way to signal that the page they are leading to is for registered content. Because of that, there's not an easy way (that I can think of right now) to trigger the SCLogin modal when those links are clicked.
I've added this to our investigate list for a future release. I do think it would be a neat feature to have, but it's simply not an option or a line of code we could simply provide to you right now.
I hope that explains, but if you have any questions, just let me know.
Thanks,
Alex