0x10 Keyframe Flag
The 0x10 flag is used with external animations to make them finish in time when stopped
with a delay. That is, when they are given a delay other than zero by
StopKey(). If the animation is given even
a small delay, it will run through all of its frames to finish in that delay if it has the 0x10 flag.
This flag was refered to by LEC as a flag meaning "unique." It's unclear what they
meant by that, but it may apply.
StopKey() and the 0x10 flag can be used
to speed up keyframes, though the effect is not as good as if the keyframe had been made faster.