http://skyrim.nexusmods.com/mods/9286 has a Races module. It changes all races however. I quote from the description concerning Khajiit.
- Added "Feline Athletics"
- Added "Survival Instinct"
- Tweaked "Claws"
- Tweaked "Night Eye" to be permanent/toggleable
I want Khajiit to feel like agile cats, and increasing movement speed and reducing falling damage via "Feline Athletics" (+ 25% speed, half falling damage) seems like a logical step to this goal. "Survival Instinct" triggers once per day, if your health drops below 25%, and increses attack speed, and movement speed even further. The bonus on "Claws" is now stamina dependent; the formula is x += (0.1*stamina).