As far as light/dark side gear, theres different levels or extremes of both. Its easy to comprehend, the more evil you act, the more darkside points you accumulate.
How would they go about offering levels of neutrality without scripting neutral specific interactions to gain neutral points from? Otherwise, your just neutral which seems impossible to progress
You just balance light options and dark options. I've got a BH that I've been leveling like that. I also use Diplomacy missions to keep the balance. She is slightly Dark, but only about -300.