I play with my own moral system already. Clearly your not a 3 time veteran of the games 
If you have a sword or knife selected but sheathed and you attack an enemy before entering combat then you will not kill him, you will see the poor bastard rolling around on the floor in pain yet not dead. Throw the body of a roof top and they are then dead.
My moral system is simple, if they are in the loop they are fair game, if not then try to avoid their deaths unless my target is too important.
Guards on rooftop I will knock out if possible.
I will not Kill guards in the street randomly or for equipment.
In later games you have in Constantinople the city guard and the templars. Here all templars are fair game while only the city guards are "spared".
Enemies of high rank in a Templar region in earlier games are fair game as it is assumed they are in the loop. ie AC2 in Florence before and after the Medici Pazzi war.
In combat aim to kill officers and lieutenants first to destroy the moral of foot soldiers.
Guards no matter rank or affiliation who are guarding Templar area's are fair game as assumed in the loop, corrupt or in desguise.
That is my moral system. The only time I break it is when mission failure would result if a semi-innocent guard does not die in order to attack/access target or if I have attracted an army of enemies and people need to die so I don't (like in ACB outside the Castello in Roma where you mush hold off for a few mins).
-----------
To th OP...
Bit late mate... a Karma system would have worked better in earlier games. In AC3 your fighting in the Americas against faceless uniform guards who all follow orders. It's a whole new shade of Grey.
Firstly I don't like the idea of Karma system as... your a fucking ASSASSIN! You kill people.
Now if there was to be a Karma system I'd want it to be hidden and severely passive.
I'd hate there to be a real impact in the game.
Ideally I would want it to be small things. What people in crowds talk about, rumours going around, what guards talk about and occasionally in dialogue people would give you nicknames. No real effect, merely superficial. You walk into the room and are adressed by your name (neutral), assassin slight positive or negative with the tone if their voices appropriate, hero of 'location', scourge of 'location' etc etc. The title isn't fixed but you have different levels of reputation.
I'd really love to see a superficial system but if there was a Karma system that affected real things........ D:
I mean there should be an achievement for being really good only killing the wicked or extremely unnecessarily brutal killing everyone in sight not allied to you... and the fact you single handedly almost made the buffalo extinct
If you have a sword or knife selected but sheathed and you attack an enemy before entering combat then you will not kill him, you will see the poor bastard rolling around on the floor in pain yet not dead. Throw the body of a roof top and they are then dead.
My moral system is simple, if they are in the loop they are fair game, if not then try to avoid their deaths unless my target is too important.
Guards on rooftop I will knock out if possible.
I will not Kill guards in the street randomly or for equipment.
In later games you have in Constantinople the city guard and the templars. Here all templars are fair game while only the city guards are "spared".
Enemies of high rank in a Templar region in earlier games are fair game as it is assumed they are in the loop. ie AC2 in Florence before and after the Medici Pazzi war.
In combat aim to kill officers and lieutenants first to destroy the moral of foot soldiers.
Guards no matter rank or affiliation who are guarding Templar area's are fair game as assumed in the loop, corrupt or in desguise.
That is my moral system. The only time I break it is when mission failure would result if a semi-innocent guard does not die in order to attack/access target or if I have attracted an army of enemies and people need to die so I don't (like in ACB outside the Castello in Roma where you mush hold off for a few mins).
-----------
To th OP...
Bit late mate... a Karma system would have worked better in earlier games. In AC3 your fighting in the Americas against faceless uniform guards who all follow orders. It's a whole new shade of Grey.
Firstly I don't like the idea of Karma system as... your a fucking ASSASSIN! You kill people.
Now if there was to be a Karma system I'd want it to be hidden and severely passive.
I'd hate there to be a real impact in the game.
Ideally I would want it to be small things. What people in crowds talk about, rumours going around, what guards talk about and occasionally in dialogue people would give you nicknames. No real effect, merely superficial. You walk into the room and are adressed by your name (neutral), assassin slight positive or negative with the tone if their voices appropriate, hero of 'location', scourge of 'location' etc etc. The title isn't fixed but you have different levels of reputation.
I'd really love to see a superficial system but if there was a Karma system that affected real things........ D:
I mean there should be an achievement for being really good only killing the wicked or extremely unnecessarily brutal killing everyone in sight not allied to you... and the fact you single handedly almost made the buffalo extinct