Unless you make some hacker really mad, the chances of anyone purposely trying to get into your computer is extremely low. Paranoia isn't really any help to anyone. If someone wants to try to hack your computer and has the skill to bypass a router's port blocking and a quality firewall, then they probably have the skill to damage your computer regardless if you're on admin or not.
I have used computers for a VERY long time and I know how to monitor it for any changes or anything unusual. I'm not concerned and will continue to use admin priveledges. Considering the amount of things I need to install/uninstall on a regular basis, I'm not about to start changing logins constantly.
As I stated, if you want the feature added, then request it. I don't mind if it's there or not because it doesn't affect me.
