If you have any partial poses avaliable, I'd suggest a test. Apply one partial, check the keyframes. Keys assigned to the rest of the actors? If yes, go back and apply a second partial that involves the untouched actors. Check keyframes again. Does the second application over-write the first? I may be wrong, but it seems to me a way to make sure the whole character stays in one piece. You wouldn't want to apply a whole bunch of partials, run an animation, only to find the left index finger remaining where it started.

The key thing from what I can understand (admittedly that isn't a lot) is that if the next applied partial pose over writes the previous ones, what's the problem?