Not to stamp on toes (Mish), but you can kinda copy+paste, but not in the traditional sense of the word. It's more of a snap-to-position. It does, however, work great with relocation  of props and lights. If you have a camera somewhere and want, say, a box that loads at default (0 0 0), you can control+c your camera (copy) or a figure, click the other item, and control+v (paste). When/if they decide to work, you can keyboard control+d and drop your object to the ground plane.

Not everything works, but props and characters of the same designation (m4 and an M4 or v4) work most of the time. If it's two M4's though, they will assume the same pose, and occasionally, the same morph. I've had that happen when doing a series of scenes with an m4 and a Freak4 character. Doh! In that case, where they're morphed radically different, I just write down the coordinates and plug 'em in on the other guy.

I totally agree with the saving objects and characters as separate files for merge. I do most of my characters like that, at least the ones I plan to use more than once (like a base set up in the T pose).

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