The function CancelBuff() is a protected function, and the only two ways of using it is either on a secure button or while out of combat.
The reason oUF has yet to implement this is because with the secure feature we would lose all kinds of filtering and sorting possible on the buffs.
It is, or at least was in the plans to add a new element to oUF, independant of the current buff system.
However, the current status makes it more feasible to get a proper buff addon.
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