When creating or editing a scene, on any control that is “active”, there are:
- a red “x”
- a grey arrow curving up and to the left
Both seem to be “clickable”. What exactly do they do? Where are they documented?
The red x clears the choice you made against that device, but as for the grey arrow, I’m not sure.
I can’t seem to make one come up myself - so I suggest you click it to find out and let us know 
The grey arrow is return to previous setting.
An example is set light 50%, add delay min, then return to previous setting.
See http://forum.micasaverde.com/index.php?action=dlattach;topic=13035.0;attach=8280 if you want a visual example