I tend to agree with Buruma about the way L and Raito (Light) are listed. Adding in all their alias really isn't necessary - things get so cluttered then, especially when most of the fans knows they used those names anyway. Common knowledge of the
Death Note name!swap extravaganza is rampant throughout the fandom - specifically concerning L and Raito.
And I also agree that Near and Mello's names aren't spoilers anymore, just because the anime finished airing. Their names have been known to people who read the manga for a very long time now.
Even L's name, at this point could probably be put up - but since it's released in Volume 13 (a bonus) that some people didn't get, as Buruma said, it's a little more spoilery, which is probably why it wasn't listed originally.
I do see what you're saying about consistencies between categories though.
ETA; Haha, seems we posted at the same time.
Concerning the romanized version of L's name - I don't think that's necessary since it's just... a letter. ^^; But that's just me.