The options below are common to both 1D and 2D blending.
You can alter the “natural” speed of the animation clips using the animation speed number fields (the columns with a clock icon at the top), so you could make the walk twice as fast by using a value of 2.0 as its speed. The Adjust Time Scale > Homogeneous Speed button rescales the speeds of the clips so that they correspond with the chosen minimum and maximum values of the parameter but keep the same relative speeds they initially had.
Note that the Adjust Time Scale drop-down is only available if all the motions are Animation ClipsAnimation data that can be used for animated characters or simple animations. It is a simple “unit” piece of motion, such as (one specific instance of) “Idle”, “Walk” or “Run”. More info
See in Glossary and not child Blend Trees.
You can mirror any humanoid AnimationAn animation using humanoid skeletons. Humanoid models generally have the same basic structure, representing the major articulate parts of the body, head and limbs. This makes it easy to map animations from one humanoid skeleton to another, allowing retargeting and inverse kinematics. More info
See in Glossary Clip in the motions list by enabling the mirror toggle at the far right. This feature enables you to use the same animation in its original form and in a mirrored version without needing twice the memory and space.