As far as moral choice systems go... This is for the commenters in general as well as Yahtzee: There's a freeware game called Iji, recently released, which also has what could be considered a moral choice system... but in this case, the system is linked to your overall and per-sector kill count (the game is divided into ten levels or "sectors").
(SPOILERS AHEAD.)
Now, the thing about this system that I personally loved is the fact that it changes a LOT about the game depending on your play style, either pacifist or what TheHelldragon likes to call MURDERSTORM. For example, there are logbooks scattered throughout the game that you can read in order to give yourself a bit more depth to the plot. This logbook is written by a high-ranking Tasen (the plot involves sudden attack and invasion by an alien race called Tasen) to his troops, listing the major threats to them at the time. Number one is your character, the "human anomaly" who's been running around with tech reverse-engineered or outright stolen from the Tasen (which lets you actually fight with them.) If you're playing murderstorm Iji, then the log is pretty obvious; watch out for the murderous human Anomaly tearing through the ranks, yadda yadda. If you're playing pacifist, though, instead you're the biggest threat because you've been gathering up all the ammo and hoarding it for God only knows what purpose. Also they're scared because of your infinite-ammo basic weapon: "Have you ever seen her shotgun run out of ammo? Scary..." And that's far from the only change... dialogue, logbooks, even several game events and enemy placements will alter depending on your style. Pacifists can even engineer situations where you can skip boss fights entirely because someone else does the work for you... which is good, since if you can get a 0 kill count there's a very shiny in-game reward for you.
Also... the ending actually doesn't change. General Tor's final words to you change a lot, depending on your style, but in the end nothing will change what happens next. What changes is how you view yourself, how everyone else in the game saw you... It's kind of like that choice you have to make in the very end of the final case of Justice for All. Phoenix never says it aloud, and NOTHING in the final dialogue changes because of it. It's completely a choice you make.
So... a moral choice system like THAT one, where replay value gets heavily conserved since the game changes so much between the styles of play... what do you guys think of that?
