Not sure if you’re this deep into Spad yet, but the Event Monitor tab and Data Monitor tab are very useful. The Data Monitor will import any loaded data variables from the sim into Spad. The Event Monitor will show which sim-events are being used.
For some aircraft, depending on how the dev coded a feature, you may need to “send simulation-event”, on other aircraft you may need to “change data value”.
The Spad discord is usually a good place to look, and Les O’Reilly hangs around in there.