In "The Fringe" there is a part, in one of the examples of play, that
goes something like this: "There is nothing about burglary in his
character description, and he wants more than 2 dice, so he spends 2
points to create a new Trait called Burglary (4). He now owes the GM
2 Details to explain his new Trait".

I can't seem to find the rules for this seemingly on-the-fly character
creation anywhere. Did I miss something? Can somebody point be to
where I can find this rules if they exist? I think this is a pretty
cool concept because games can start instantly, with only a quick
decision on character concept.