I would of had them work on the balancing far more then tweaking small issues like that which do not effect game play in the slightest, they worked very hard to get the game where it is now and in my opinion have made the best AvP game to date.
That small little graphic effect was not top priority when making this game, it would have been nice but eh, the sequel is where they can touch up on all these things..
They created a completely new engine for this game instead of using an existing engine like UR's, now that it's solid, they can tweak it however they want and are not restricted by time issues, so maybe in the future, maybe in the sequel.