Have you change the default setting for the "Still/Freeze Duration" to 00:00:00:01(one frame) ? by doing this, all the import picture sequence will be charged. Of course, you need to re-import all the pics again.
User Preference -> Editing -> Still/Freeze Duration
(FCP 4HD)
For changing the frame size at once, you could use the "Paste Attribute" to clone the parameter of the "Basic Motion" to each others
Antonio Hui