We let you define events after-the-fact based on the gesture type and the corresponding target variable. Once that event is defined, you can include it in funnels, view it in user-specific activity streams, slice n' dice it, etc.
FYI, I don't think you're using the work "cohort" correctly in the video. Cohorts are stable groups, composed of the same people over time. "Users who send 5 links" is not a cohort, as the group's composition changes over time.
For that matter, how do you identify the user? If the user logged in from two different machines, does it count as one user or two?
It counts as two, since by default we identify users with first-party cookies. We offer a heap.identify() API call that can be made to associate multiple devices with one identity.