Facebook – How to find a list of people so I can request them as a friend

Just found a webapp that may be a start http://dtinth.github.io/friendlist/ it's a bit better as an interface to manage friend lists, but nowhere as powerful as what I would love to have :(

EDIT: Link updated as it was returning a 404. It is worth noting that this development on this web app has been stopped. However, you can find the source code on Github https://github.com/dtinth/friendlist

I'm not sure the second part of the question question makes sense...

If you think of Facebook connections as ever-widening circles, you have:

• Yourself
  • Friends
    • Friends of Friends
      • Strangers

You want to reduce the "can send friends request" to "narrower than 'Friends of Friends'", right? But if you look at the hierarchy above, exactly who would include? Either "some" Friends of Friends, which Facebook would need to know how to narrow to "some", or just to "Friends". If the latter, well, Friends don't need to send you a friends request, true?