Ever since Tom Clancy games started coming out on console first, mods have almost been nonexistent (i.e., after R6-3), and rightly so, since Vegas is almost a straight port with no consideration for end-user modification (since you can't do that on a console).
I do hope that the cover and shoot system used in the game survives to either GRAW2 or the next R6; it was dynamic, fluid and easy to use, and more realistic than not having it.