Add possibility to define custom blocked services

The feature to just quickly block & unblock popular sites and services in the general tab with a simple click is awesome.
As a father of children who sometimes overdo it with online gaming, it would be great if you could define your own custom services there to extend and customize the list of services.
I think of it like this:
You simply enter the name of your service and it creates a small separate block list associated with this service name. With a toggle button somewhere in the UI you now can simply enable enable and disable the blocking of these DNS entries.

In theory you could go even further and also add the ability to schedule times when those services are automatically blocked.
I think this could be a really useful feature.