-apply the camera shake and from the output scale up the image about .008 in size with a "Move2D" node
-from the camera shake node output again put an "Over" node but branching to a different noodle
-your Move2D node should be attached as the second input of the Over node so the original is on top
-repeat the process a bunch of times (i did it 10 times)
-give it a "Blur" at the very end
-then slap your original back on top with another Over node (the original should also come from the camera shake output so the image lines up with the giant pointless node tree you built)
now notice i said pointless at the end of that whole process. thats because i already did it hahaha. i built a macro and put it up here on the site. you should be able to download it within the next couple of days. its called CameraShakePlus. it may or may not have spaces, but im sure you'll be able to find it. give me some feedback so i can make any necessary changes.