After seeing how DarkFact did bodies in his game, I decided I'd try it myself. It's quite easy.
Free Dead Body Example Packs:
Download Dead Body Example Pack 1 [Colonel X] (FPSC Required)
Download Dead Body Example Pack 2 [Aiko] (FPSC Required)
Both Example Packs are FPSC Ready, not Milkshape examples
Screenshots further down.
Tutorial:
First, use something like FragMotion to import any character from FPSC (I used the specialist from MP1) and export it to a milkshape file with the skeleton. Now, open it up. Select anim mode and make the first frame into the pose you want, and go to Animate->Set Keyframe. For Example:
Now, go to Animate->SMD Adjust Keys and make it look like this:
Now, go out of animation mode. The body should remain the same. Highlight and delete the entire skeleton.
EDIT: Exporting Setup:
And here's my outcome (You'll have to make it FPSC ready yourself):
EDIT 2: Maybe using my content installer I'll make a 'Dead Body Pack' using FPSC characters (probally just scifi to start)