@krashadam For GTA V this method is not an usefull possibility because uses IK, no plenty interpolated animations like Saints Row games. Also, GTA V animation files not just contains the bones interpolation base, includes others data like scenary IDs, sounds and props calls, some Scaleform assets (a hell to handle it via hex edition), IK flags and some weird vertex shader references, for these reassons the tools not has been finished yet. You can edit base skeleton interpolation in any bone editing its hex, but not will to work well in game or will to mess the engine rendering math causing errors and crashes.