Suggestion: Allow optional (disableable) keys to allow/block

[samyk]

It would be nice to allow keys to allow/block when the popup appears. For example requiring a tab to first get to the Block button, then another tab to get to Allow button, and Enter to continue. Just an Esc could block this once without creating a rule.

This may be considered a security risk but I think would be nice as an option, even if it's off by default.

Thanks!