In my opinion, it would be good if the amount of damage needed to disable a limb should be decreased, but the amount of time to remove a limb should actually be increased.
The issue with losing limbs is that actually regaining said limbs is often either incredibly hard/unlikely or downright impossible. Even with the existence of prosthetic limbs, those are rarely made due to how often materials are either scarce or medical is just incompetent. Maybe if either replacement limbs were easier to retrieve/more common it would be good to make it easier to remove them, but as of now I would recommend against it.
However, I definitely do like the idea of making disabling limbs easier, since people rarely use the limb target feature to go after anything other than the body or head.
