Ability to disable debugger permanently based on cookie

Debugger in In-Portal is only enabled, when site visitor's IP address is listed in "debug.php" file. However this is not enough, when developers are using shared IP (for example during Network Address Translation usage) and one or more of the developers wants to disable debug mode for him only.

Also useful, when managers and developers of company, using In-Portal share the same IP address and managers don't want to be in debug mode at all.

I see this as "Turn Off" button in debugger toolbar. Once clicked user will be asked for confirmation and debugger will disabled for current site.