It would be nice to set a display subtitle on custom events so you can view some additional data in PlayStream just like you can for UpdatePlayerStatistic events.
Example:
Player statistic changed
WINS: 9
However currently a custom event looks like this (without any additional data):
My custom event
This request is not to display any of the JSON Body parameters and values from the custom event in the subtitle, but to provide a subtitle string that we can set that is at the same level as the EventName.