The commands on the Keys menu let you add animation keys and align them to the cursor as well as use soft selection for transforming keys.
Adds keys in the Curve Editor or Dope Sheet. After activating the Add Key tool, click a curve (in Curve Editor) or track (in Dope Sheet) to add a key at that location. In both modes you can change the timing by dragging horizontally after you click. Also, in Curve Editor, you can change the value by dragging vertically after you click the curve. See Add Keys.
When active, transforms affect keys adjacent to a selection set of keys. Works on Curves and Dope Sheet edit keys mode. See Use Soft Select.
Opens the Soft Selection dialog as a toolbar, docked by default at the bottom of the Track View window. Use the controls to toggle soft selection and to adjust the range and falloff of the soft selection. See Soft Selection Settings.
Proportionally increases or decreases the key values (in space, not time). Use in combination with the Scale Value Origin Slider. See Align to Cursor.