Not sure why this hasn't been posted yet but there's a crapton of Bughunt mods spawning on the internets.
Lurkers Only/No Mercs mod/Weld doors etchttp://www.moddb.com/mods/aliens-survival-experience/downloadsBoiler added to bughunt/Weld Doors/etchttp://steamcommunity.com/sharedfiles/filedetails/?id=269584251Adds loads to the gameplay, and Tribute finally feels a lot more like the movie without those damn Mercs. I suggest you all try them.