nando, if you check the output of !addpattern -h you will see that there are many options to the pattern command, and a number of different actions, where notify is one of them.
(if you really whant to both mute and notify, all you need to do is add two patterns with different actions).
The concept of muting some ones messages is that it should be subtle, if you want to mute a person you just to that with the mute command, and then he also will get a reason why.