Adjusting Mecanim animation effect on bones?

Hi,

I'm wondering if it's somehow possible to change the effect of how much the Mecanim animations control the bones or finetune the effect somehow.

In this image below I have my golem in T-pose in the upper left corner and next to it, it's in mecanim's idle animation state. As you can see, his legs are going wider than his shoulders and the arms are too close to each other so they should be adjusted somehow.

Below those there's an example of what I'm looking for, demonstrated on Mixamo. For example the "Arm space" slider allows me to wider the arms for the walking animation.

Can this be done somehow in Unity with Mecanim?