Only show added options to admins

Hi there, this is pretty important and urgent.

I've set up custom admin bar for some really quick links to develop my site, including private access to certain areas.

However, I was not aware that these links are shown to everyone?? O.O

Yes I know they are password protected, but I do not want to even bring people to these areas for risk of brute force hacking.

Can an option of role level be added, so that each link will only show to users based on their role level?

Thanks.