You can paste into an action. Just put you sig in the clipboard and go. if, in a year from now, you have another hundred to sign, you'll just need to open up your sig and copy the layer.
the only problem I can think of is if your photos are of various sizes. the location of the sig after the action is complete is governed by how much you bumped it after you pasted. Therefore, on a smaller photo, your sig will be off in La-La land somewhere, and in a larger pic the sig will be farther away from the edge of the image, or closer to the center, however you wanna look at it. But even if you have four sizes most of your photos are, you'll still only be doing four sigs by hand.
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