x2 XP < level 50
I came across an old forum post or something that suggested US Live put in x2 XP as a permanent mechanic for anyone under level 50. I'm pretty sure we never did that in l1j-en, even if several pservers customized things similar to it themselves.
I'm thinking of adding a second "xp rate" option to cover it. It'd be a multiple for whatever the base XP is set to but only applied to levels < 50