I remember this issue coming up years ago. I thought you built the backbone for this, but never implemented it? For instance, I use or maybe still do get a pop up when I delete a registration asking why the registration was deleted. Can't remember if that pop up still shows up now or not. Not sure why you didn't move forward with that.
I also remember about a year ago a discussion thread regarding implementing an audit trail or an activity log report that could be viewed to show what is going on and happening on the application. Not sure what ever came of that. The audit log or activity log would be very useful as I know we have wondered what happened at times when funky stuff happens on the WA site. Hope to see that come back up on the to do list.