I'd like the ability to consider negatively filtering a site from the view. My thought is that there are various domains that dominate the statistics like RMM tools, Office365, and other things that are chatty. It's 'good to have' these stats but they bury some of the traffic that's not client/server behind the scenes. If I could mute out my RMM tool I might see more useful data with it being the top #1 talking domain in the org.
On the flip side it may be useful to mark a site for extra auditing. In some cases I want to know if people are going to a bad site but I don't want to interfere. I simply want to be alerted or gather the statistics passively. In a competing product there's an option to whitelist something and then choose to log it if the alert hits. Useful for investigations.