Okay, there are indeed some various cheap tricks that were brought to my attention a while ago (thru GFs and RL). After seeing and actually trying out some myself, I simply don't think that these "tricks" should be allowed. One has already been blocked (the suicide glitch), but that's simply not enough, IMO.
You may or may not know this, but the Dark missions for Westopolis, Glyphic Canyon, The Doom, GUN Fortress, Lethal Highway, and Death Ruins have the potential for an almost infinite Dark score simply by continually reviving and killing a GUN Soldier.
As of now, we should do something about this trick in some way or another; I'd like to hear your suggestions.