Suggestion: Additional options for built-in Java model animations

I think there should be a speed factor for Java model animations. It could appear as a number value beside any eligible groups; a speed of 0 would stop the animation, a speed of 1 would be normal, a speed of 2 would be twice as fast, etc.

I also think there should be a "constant" factor. Checking this would cause the animation to repeat no matter what the entity is doing. For example, the leg swing animation only plays when the entity walks. Checking "constant" on this animation would cause the entity's legs to swing constantly. This would be useful for wing flapping animations using the leg or arm animations.