In the movement section of the 4th edition core it states how a Free or Simple action can be used for movement. Now my big question is, since they separate the concept of a complex action to move as a "special case scenario", but list the maximum movement default as Water x 20', so should a character be allowed to use two simple move actions in a single turn as a difference between walking and running? Or do they only get one simple action because you can't just move as a complex action for Water x 20' on its own?
Currently I am running it as only being able to do one of the move actions (IE so that the free and simple moves can't be stacked), which leaves it with Water x 10' max movement unless special stuff comes into play. However, since I predict a chase scene in the next game the ability to double land speed will be vital.