Great question. The data declared in EventDB is based directly off of the UDO and the associated Data Sources declared in Tealium iQ. So the data the determins the SC event to trigger should already be present.
For example, if you want to trigger an scAdd event, it's usually based off of a UDO variable event_name. You might have an extension that checks if eventname="cart add" and if so then trigger the scAdd event. So if you are able to leverage the event_name field in EventDB field, it may give you what you need.
If this isn't what you're looking for, you could always update the extension setting scAdd to also set a "sc_event" variable and set it to the SC specific custom event name. This would pass the true name of the SC event to EventDB.
This may be a semi-generic answer, but please let me know if any further guidance is needed.