How would you like the feature to work?

{

    "command": "release",

    "bones": [bone name array, ...]

}

Why is this feature important to you? How would it benefit the community?

Currently there isn't a way to release bones(at least, according to documentation), thus if a element becomes untrackable(EG: arms, hands, etc), they'll just stick in place until the plugin shuts down or until they become trackable again.
Plugins should be able to inform the viewer it doesn't want to control a bone anymore, thus allowing whatever animations are controlling those bones to take back control.