I was actually thinking of the concept of borrowing, but I'm not sure. Chances are I will.

And yes, that is if you actually get caught. Although if your not caught, the guilds might still put a watch on you and see just how good a thief you are before inviting you into the guild. I'm not sure how I'll work this part, but I have a pretty good idea. And if a king happens to have connections in a thieves guild, they might hear about your... exploits and decide you to be a threat that way.

Edit:

I put up an article on my forums.
http://forums.designcommunity.co.uk/...p?showtopic=25

It gives a slightly more interesting description of what happens in the game, as well as going more in-depth on how the Butterfly Effect will work.