You can (using sandbox settings) Change Weightreduction, Capacity, Weight and RunSpeedModifier Independently of One Another. Or use Presets if You don't Feel Like Balancing Yourself
Pocket Kittens adds several different breeds of kitties for you to trap and give a "furever home" to. They roam mostly in cities and trailer parks but can sometimes be found in the forest. Set up traps with the appropriate bait and wait.