Well, like you me too did not find this mod very helpful for myself.
But as we see from comments that there are many people who enjoys it. It means the mod should not be called "Totaly Useless"

When it comes to security risk, Any hacker knows that domain.com/cpanel is the needed url :)

For me, once I login to cPanel, it takes the whole page and does not remain in the iFrame as the login page does (and as I expected this to work).
If Cpanel isn't going to remain in the iFrame, I see no advantage to having this mod... I may as well just use my desktop shortcut.

the issue is that your super mods will have constant access to the link via your admincp

I use this product to see my homepage and as well new threads from AdminCP :)

Excellent work on 4.1.10

What does this do exactly?
--------Update-------
I know now, thanks :)
I read some other posts about it

Great idea.
For those of you who are having the page jump out of frame.
It could be because you used the wrong url.
Instead of using yourforum.com/cpanel use the actual cpanel address and it should then stop jumping out of frame.

Add this to your link for auto login.

http://DOMAIN:2082/login/?user=USERNAME&pass=PASSWORD

Note: Not recommended. But its up to you. Could be a security issue so be careful.