Automatically block all after inactivity/screensaver

This is one failing fo CIS, its VERY useful, when i walk away from my PC i want to know that it will automatically kill my connection (if not downloading via a download manager of course) after a period of inactivity (either LAN inactivity) or system inactivity (screensaver)

Can you please please put this overlooked (and asked for since v2 i might ad) feature in…?