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A weapon flag to disable all offset/bob interpolation for the weapon. Yes, some animations are made with the lack of interpolation in mind, and look bogus when subjected to it. (For things like Hexen's Bloodscourge, it makes the "jumpiness" of the animation even more noticeable.)

Before such a flag is considered, there first needs to be a smarter detection logic to decide whether something needs to be interpolated or not.