So to the limit says:
Use after you resolve Special Action icon during your activation to perform 1 additional action. Then you become Stunned.
So two things It gives the special action icon and doesn't just say action do you have to spend a special action to gain it and not just a regular move or attack action and second when you perform this action extra action, can you spend the movement points you gained or are you stunned right away. Meaning To the limit is only useful for attacking and special actions?