Exit monitoring
Exit monitoring is a hot feature you need to add.
To increase the conversion rate, some sites are monitoring the user's mouse/navigation behavior. When the user does the movment to exit the site, the chat window will open with some message to retain the user like the modal popups in http://exitmonitor.com/

Hi there Paulo,
Although this is a good idea, it’s not something we are planning on doing in the near future as that is a completely different area of Visitor retention. And, as you pointed out, there are currently services offering such functionality which you could combine with our Widget.
Hope this answers your question.