The commands on the Keys menu give you control over keys when working in either the Curve Editor or the Dope Sheet.
Add Keys—Adds keys in the Curve Editor or Dope Sheet. See Add Keys (Dope Sheet).
Reduce Keys—Reduces the amount of keys on curves, or in edit keys mode in Dope Sheet. See Reduce Keys.
Move—Moves keys either vertically (in value) or horizontally (in time). See Move Keys (Dope Sheet) or Move Keys (Curve Editor).
Slide—Moves keys, and adjacent keys slide away to make room for the move. See Slide Keys.
Scale Values—Proportionally increase or decrease the key values (in space, not time). Use in combination with the Scale Value Origin Slider. See Scale Values.
Scale Keys - Time—Proportionally increase or decrease the key values (in space, not time). Use in combination with the Scale Value Origin Slider. See Scale Keys - Time.
Use Soft Select—When turned on, affects keys adjacent to a selection set of keys according to a falloff threshold. Works on Curves and Dope Sheet edit keys mode. See Use Soft Select.
Soft Select Settings—Use Soft Select Settings to display the dialog that lets you control the falloff range of the soft selection. Select some keys, then watch the Track View Key window while you adjust the range value. See Soft Selection Settings.
Note: By default, the Soft Selection dialog appears as a toolbar on the bottom of the Track View dialog.
Align to Cursor—Proportionally increases or decreases the key values (in space, not time). Use in combination with the Scale Value Origin Slider. See Align to Cursor.
Snap Frames—When this is on, keys always snap to frames. When off, you can move keys to sub-frame positions. See Snap Frames.