A small list of enhancements (yes I put in the first one) to vote for:
Notify user on failure -- So when a condition is not met, the user is notified, instead of having no idea and a banner that says the rule ran successfully.
Sticky div for add component -- So we don't have to scroll up and down to add new components to a long rule.
Allow Rule Actor to be dynamically set -- So the actual user who triggered the action is listed in the history, comments, etc.
Great list @Bill Sheboy
My fav 3 would be: