Sanglamorre
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Like you said, it's strictly for negating orbit decay. They don't carry enough propellant for positioning wherever and whenever there is a trouble and we need an eye.They can be maneuvered to some extent in their orbit.. But, i think they would use this sparingly.. as it uses precious fuel , which is need to raise the satellite's orbit periodically to counter decay due to atmospheric resistance in low earth orbits.
What they can do is move their instruments on board to 'point' at a region as much as they can.