I would like to track the system changes event, to make them revertable. When checking variable_set(), I see there is no hook provided for that event. Is there any way for me to do this?
I can alter to hook to settings forms, but there's a lot of settings form to track, if I can hook to variable_set() directly, code becomes much simpler.
I can also track the variable changes with features + strongarm modules, but it's better if Drupal admin can browse the variable history without code touching.