Start Event Field and End Event Timestamp

I had a usecase where i needed to add a special field from the start event to the elapsed event. 
And I needed to add the end event timestamp to the elapsed event aswell because the time difference was sometimes less than a few milliseconds which does not show if the elapsed time is shown in seconds.

I don't know how to update the specification file for this plugin. I am not even sure what it does. Someone else needs to take a look at that.