I appreciated noism's recent post about expanding the usefulness of the luck stat in CyberPunk 2020. Basically, when players are problem solving and ask the DM a question like, "is the guard alert or did he fall asleep at his post" the they can roll their luck stat to determine the answer.
In addition to adopting this, I think I'll use it to expand my use of clues. i.e. if the player makes their luck roll then there is a clue to be found.
I wonder how far can we take this before it breaks? For instance, in determining treasure: "You're lucky and he had just made a large cash withdrawal before you mugged him."