CI4 event listener

I need to do something more than the usual with ci4 event listener,  unfortunately it did not work. and I was too lazy to extend the class on my own, I checked github and found this listener Lib https://github.com/slince/event . 
So I was thinking if the ci4 Dev team might think of using this as a replacement for the current. It's simple with a little tiny feature better than that of the current ci4 listener. 

@jlp @Narf @kilishan

CI4 is not finished. what do you need?