FBXImportProtectDrivenKeys -v [true|false];
FBXImportProtectDrivenKeys -q;
Use this script to prevent any incoming animation from overwriting channels with driven keys.
If set to True, the driven keys are protected and no incoming animation is applied to the driven channels.
If set to False, the driven keys are discarded and the incoming animation is applied to the driven channels. See Protect Driven Keys for more information.