It seems to me that this would be a relatively simple fix. Granted, I'm no programmer, but all you'd have to do is change some values, correct? Regardless, I can't stand using "grenades" that bounce or otherwise behave unpredictably. For example, if I go to throw an object and I'm not sure where it's going to wind up, it's going to make me not want to use the object. It doesn't help that a lot of the items that Ripley can make seem to be of the build-it-and-toss it variety.
Other questions regarding the physics of other objects in the game. I'm assuming that everything can interact with the player/NPCs? Will you be able to pick up objects like, say, Half-Life or Doom 3, even if you can't put said object in your pack? Does the Alien bump into things or knock them over?