I thought if you attached a new roster to the DKP system that it would only include those people in the current standings list. Is this not the case?
This is not currently the case. Because DKP is assigned to the character in a particular DKP System, that character remains included in the standings, whether or not the character is in the assigned roster.
The primary purpose was to limit the input functionality (for users that must enter DKP manually, it really helps to have a limited list), but it makes sense to modify it for display purposes.
I'll get this added.
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It's all in the reflexes.