For RTB preferences like duplicator prefs, it should display what was updated. If it is a drop down such as:
Admin controlsKick: Admin/Super admin (Pick which one)
When you change it, it will say -Admin controls- Kick changed to super admin
Or
Baseplate required sizeSize: 16x16, 32x32 (Pick which one)
it will say -Baseplate Required Size- Size changed to 16x16
It would work the same way with number values:
Auto SaverMinutes between auto saving:
- (I will pick 27 as my number of minutes)
it will say -Auto Saver- Minutes between auto saving changed to 27