Fey Alignment

One more way I'm trying to make Fey Elves alien is by having the Fey, including any Elven characters, use a different alignment system. This alignment system straddles the line between D&D and AD&D conceptions of alignment: I imagine both Seelie and Unseelie courts, for example, though I haven't figured out how to flesh that out yet, besides members of different alignments generally avoiding or being somewhat antagonistic towards each other; on the other hand, these alignments definitely serve as AD&D-style roleplaying aids. What do you think?
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Elves, and indeed all Fey, are not aligned along the Law-Chaos axis. They have little to do with metaphysical concepts of Order or the progress of Man’s civilization and they, being inherently of Nature, cannot engage in unnatural Necromancy or Summoning. Indeed, the Elves continue to hold the entire Fey outlook and are aligned along the Seelie-Unseelie and Trooping-Solitary axes.

Seelie Fey, including Elves, are lighthearted, fickle pranksters and change their attitudes towards other characters easily, neither holding grudges nor gratitude for long. They are generally friendly when first meeting someone and as prone to performing acts of service for no reason as to pranks and practical jokes. The Unseelie Fey, again including Elves, are generally aloof if not unfriendly to new acquaintances or strangers and not prone to spontaneous pranks or services. They hold both grudges and gratitude for a long time, if not forever.

Whether Seelie or Unseelie, Elves, as Fey, should always be roleplayed with no appreciation for Man’s ideas of proportion, whether dealing with pranks, random kindnesses, thanks or revenge. Both beneficial and malicious actions should be more than a Man would find appropriate or worth the trouble.

All Elves that join mortal parties are Solitary. Elves that travel in all-Fey parties or who settle down in forests where they establish a Fastness are Trooping. Solitary Elves must leave their parties and wonder alone for a month in order to level up. Trooping Elves must not leave their troop for any reason and most interaction with mortals must be corporate instead of individually building relationships with mortals.