No anyone can. But, once decided, they can't be changed. I am going to ask Sir Duke, my Forums on Forums confidant how that can be changed. I can't even get to mine as an admin.
You can, though. See if you can get me to at least four.
I think I may also figure out how to make the edit reason blank by default. That is used incorrectly. It is supposed to be used to tell people why you made a change that really affected your post.