Is there a certain percentage of the limbs that have to be patterned or is there no definitive difference? Is it all just a matter of personal opinion?
Either way, I don't think we'll ever be able to get everyone on the same page or get them to all use the terms correctly. The reason I say that is because there are pictures of ciliatus labeled "Harlequin" in the new Rhac book with much less pattern on their legs than the one that you called a flame. Basically, what you call fire/flame, another breeder might call a harlequin, and you may both be right. They're so similar and there's such a fine line that separates them, I don't see why anyone feels a need to differentiate. The terms Harlequin and Flame/Fire are going to end up being used synonymously in the ciliatus trade anyway.
Further more, what about the ones that have a little of everything? I've got one gecko that is partially pinstriped, shows a slight amount of the white fringed trait, qualifies as a harlequin, and it has dalmatian spotting to boot. You wouldn't believe the number of people that have looked at it and been so preoccupied with figuring out what to call it, that it became more of a topic of discussion than the gecko itself. They're like "Oh that's awesome....but wait, what would you call that one? A fire, a harlequin, or a pinstriped? Or wait, what do they call that when they have white on their legs? Well, it has black spots too, so does that mean it'a dalmatian?" I usually answer with something like "I don't know...I just call it nice."
Anyway, just food for thought...as you can tell, I like discussing these little guys. 
BTW, Here's a pic the gecko I was referring to. 
>>This is what I call harliqin.
>>
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>>Paul Morlock
>>of CaptiveCreations and
>>Retial Sales Rep. for Sandfire Dragon Ranch

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Anthony Caponetto
http://reptiles.drivennewmedia.com