No, there's no way to just do a straight crop across the board.
But like OldScratch said, you want to crop each frame by itself to get the best framing.
And even then, it doesn't take that long...*
And you don't want to export and crop that, remember that every time you export/render something, it may loose just a tiny bit of quality. Plus then you have to chop that up into tiny pieces to edit.
*Remember, this is stop-motion that you're into. Nothing goes quickly, and everything needs to be hand-done or else it'll look bad.