Assign a button to tag an event in logs

Is there a parameter or something that can be assigned to a button\switch that when triggered just tags an event in the log? I’ve had a couple of fail safes (no radio signal) occur but they aren’t always in the log. But I’d like to be able to mark when an event occurs so I can easily analyze it. Thoughts?

RC in is recorded for all channels. Just move or toggle a switch on an unused channel, then you’ll find it in log easily.

Hmm I’m on the Skyviper and have buttons, I might have to figure something else out. Thanks!