Well, I'm against.
I like playing with non-combatant characters, but still, no xp from killing monsters is not like cRPG. And objective "get out alive from ambush" sounds a bit weird... It's like "you don't get XP for killing each enemy, but you get XP for killing all enemies". It' would work in, some linear game, but if we would have open, waste world no combat-xp will ruin all map roaming fun.
I don't agree. But maybee it could be good idea to have two xp pools - combatant and non-combatant. That could be used absolutely independent (I know, that would be imposible if we would have some D&D like levels.)
As long as you are free to choose aligment, you can play chaotic evil homicidal maniac. More experience, but harder live, beacuse evryone will kill such a public enemy. With no xp from killing, such character have no sense.