On RPG Theory: R
Railroading: CHOO-CHOO! All aboard the train which will take you where I'm going!
Relationship Map: Something I thought was fairly original turned out to already have a name. I like to call this power structure.
Resource: A pool which the game draws upon. The reduction of this results in harm to the character.
Reward System: Gooooold, I like Gooooold.
RFGA; Once upon a moon, I posted here, long ago.
Role Levels: Levels of player involvement - the social role of the character, the thematic role, the in-character role, and the effectiveness of the character.
That last is certainly something that deserves further study.