Dr. Beckett put in place a set of rules that the time traveller shall obey most likely for the same reason the Federation instituted the "Prime Directive". To quote Jonathan Archer(also played by Scott Bakula ), "We didn't come out here to play God." Back on the subject of QL, Dr. Sam Beckett probably put those rules in place because he was afraid of the time traveller(which ended up being him) taking advantage of his position. Having that much power might corrupt one. What do you think?
~Steve B.
~Steve B.