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It might do but they're difficult to blend in with the surrounding area. Also depends on the amount of movement. When I've had similar problems on a ceiling under a roof it's been after roofers have been walking on it.
Sometimes helps to add some more washers/screws at new positions along the joist.
Plasterboard screws don't rust but it's difficult to find washers in the same material so you might need to use a stain sealer or primer on the washers before filling over them.
If you press on the plasterboard with your hand you might see the movement.
Airhead
Would a flexible filler help? I will try the washer trick and report back @Airhead