You know how when you are spreading out dough to make cinnamon rolls or pizza the instructions usually tell you to use flour if the dough is sticky? I find if I add too much flour I can toughen my dough and make it hard to spread out. (I am sure it has something to do with adding more gluten, but I don't know the science behind it. I am not Alton Brown!)
I discovered that if the dough is generally compliant, but just a little bit sticky I can spray the surface of my dough with non-stick spray (and my hands or rolling pin too). Adding the oil keeps the dough nice and soft and it spreads or rolls out very easily without toughening up.