My sorcerer is light III. Occasionally quest givers are disappointed and sometimes angry with your choices, but there's not a whole lot they can do about it. Khem Val doesn't like lightside choices, but I've been showering him in gifts.
Khem Val likes some lightside choices if they are manly enough. And the only reason why most NPCs dont get dissapointed over darkside choice is because they are used to it. Lightside choices for inq are usually rational and benefit empire though sometimes they are really ridiculous and