There IS a mod for DF:LW you can get mate, as well as an add-on bunch of terrains/maps
MOD666:LW re-skins the guns, so they look more realistic than the original guns, also it replaces the skin on the Steyr Aug with a M4 (it still fires the same as the Steyr, and you still have a 2x scope, but it looks better - personal opinion anyway
EXP:LW adds terrains, maps and sounds - including some kick-arse co-op maps (that you can also play as SP maps)