Custom tracking events are currently based on a session, the same as with conversion events. It would be great if there was a setting or something you could pass into a custom event to say this should be tracked to the session or only tracked directly on the content entry in which it happens.
The use case: let's say you have 2 pages that have product grids. The user hits the first page and clicks on the second page. On the second page, they fire a clickProductGrid event. Currently, both pages would show that event as it happened during the session. But often you only want to report it on the page where it actually happened.