Time Editor Weight contextual menu

To view the Weight contextual menu

Set Key
Sets a keyframe at the point in the animation in the Time Editor shown by the timeline indicator. These keys affect only the animation clip in the Time Editor Track View and do not affect the original Animation Source.
Set Driven Key
Opens the Set Driven Key window.
Lock Attribute
Freezes the Track Weight value so you cannot edit it.
Edit Weight Curve in Graph Editor
Opens the Graph Editor for you to make curve edits with greater precision.