to manipulate groups of keys (proportionally or in relation to a selected key).

To disable the single-click editing workflow in the Graph Editor
to explicitly move keys using the middle mouse button.
is available in the
Graph Editor Toolbar and from the
Transformation Tools in the
Dope Sheet Edit menu.
Move Only
disables the tool's ability to sweep throughout a curve's keys (see Move Over).


Graph Editor and Dope Sheet Move Only option
Move Over
lets the tool sweep through an active curve along the curve's keys. This expedites the fine-tuning of animation curves. This setting is the default.


Graph Editor and Dope Sheet Move Over option



Graph Editor and Dope Sheet Ripple option
Constant
moves all keys the same amount in the direction you drag.
Linear
moves all keys based on the distance they are from the mouse down location. The amount a key moves decreases linearly as its distance from the mouse down location increases.
Exponential
moves all keys based on the distance-squared they are from the mouse down location. The amount a key moves decreases exponentially as its distance from the mouse down location increases.