I just accidentally hit "Reset Settings" at the bottom of an Atahualpa Theme Options page, because my arm slipped and the mouse clicked it.. And lo and behold, all the settings were reset, not even to the atahualpa version defaults, but to some other defaults.. And it didn't prompt me!
I thinks it's pretty important to implement a confirmation dialog for this button.. I'm lucky I only lost a few settings, but imagine if this had happened on my CSS page with hundreds of lines of code..
EDIT: in the meantime, I set the css of that button to display:none, so that it's completely gone from the admin screens