There have been several attempts to date; AFAIK they've never gone very far.
Animating the Vasudans shouldn't be too difficult, we do have some idea of how they move (FS1 Intel had a walking Vasudan), and overall combat behavior would be similar to a human I expect. The Shivans would be more of a problem. Let's face it; they were kinda poorly animated in Hallfight. We have no real idea what "normal" movement for a Shivan looks like. We've only ever seen them standing still (FS1 Intel) or on the attack (Hallfight; badly animated. And the FS1 Intel again, which is probably a better source.)
There will also be interpretation problems; to me it seems pretty clear Shivans were designed for null/low gravity close-quarters combat (newtonian physics in an FPS, makes your brain hurt, huh?), and would be considerably less agile than they were in Hallfight at what we think of as normal gravity. I also think they would have serious issues if the opposing side was given a reasonably clear 100 or 200 feet the Shivans would have to get across. But other people think other things.
I've toyed with the idea myself, and I've kept brief notes on possible weaponry I'd be willing to donate to the cause, perhaps some modelling of weapons or environments.
Poll
