You have this option if you use one of the other blocking modes available. Modes IP and IP-NODATA-AAAA both provide a built-in blocking page.
This section of the documentation discusses how to make this configuration change. It is a line item in a configuration file, very easy to set up.
Edit - Yes.
There is a related thread on forcing safe browsing that uses redirection methods - that may be of interest to you:
Finally, your English is fine and is much better than my French. 