JimF,
Unfortunately, you cannot select multiple objects on multiple pages. You could select all of them at once if they were on the same page, but not on multiple pages.
One thing I can suggest may be to use the Object Inspector panel(by default it's on the right of the screen. If you don't see it, go to View->Object Inspector.) to access the coordinates quickly, and then change them. If you only need to change one, you could even copy the value you need to enter, and just paste it using CTRL+v, then move to the next object. While not as quick as selecting them all at once would be, it's still faster than double-clicking on all of them.
Regards,
Rapha