Thier unarmed bonus is the worst, when are you ever in the situation where you have no weapons and are forced to use your fists?
On top of that, there is no skill to increase to make them not worth using at all. 15 damage? Even with the best glove enchantments in the game, you would still be doing much better with any other weapon.
My suggestion: "Prices are 25% better." and "Take 60% less fall damage."
Reason: Pretty much every Khajit in the game is a trader, right? So surely they have trading in thier blood, and should be able to buy at better prices?
Now, on to thier activatible racial. Admitted this isan't as useless, but it is still awful compared to any of the other racials. There arn't really that many extremly dark places in the game, and when there are you can always use a torch,
My suggestion: "Run 30% faster and jump higher for 30 seconds."
Reason: Thier cats, arn't they? Cats are known for thier speed and agility, and this would be useful for escaping or quick travel.
These are just ideas, they may not be very good but they are certaintly better than thier current racials.