using 'Set Activated' is an option but using 'Ignore Input' is better because in many cases you want the sprite to get affected by the properties of the behavior like gravity etc. but don't want it to respond to user's input.
An example would be that suppose if you want to switch controls between 2 sprites with Platform behavior. If your one of the sprites is in mid air(jumping) and you disable it's platform behavior, it will hang in the mid air and the control will go to the other sprite.
Here is an example of ignore input.
http://dl.dropbox.com/u/5811650/Help%20 ... ntrols.cap
While that is good for your example, its not very good if you have 2 movement behaviors on the same object as the OP said. If you have platform movement and physics behavior on the same object for example, and have both activated you will get weird results.