Possible feat: Skill Mastery

[The Iron Mark]

You're always sneaky, but you can choose to be not sneaky if you don't want to be. All it does is that you are constantly taking 10, unless you say otherwise.

 

[Saeviomagy]

Otherwise he'd be "Ninja of the crescent mime"...

The problem with that skill mastery ability is that taking 10 is more of a time-saving mechanic than anything else - usually if you're using skills in a combat situation, they'll be opposed, and unless you're really good, taking 10 won't be enough.

And if you are really good, taking 10 isn't a huge help.

What it does let you do is get a +15 bonus to tumble exactly, just so you can automatically tumble through foes. The same goes for other fixed DC skills.