Karma is a ... variable as same as other stats. You can theoreticly use as "Random(X,Y) - karma" to have the value between X and Y.Edit: I think it has highly association with karma as tkwas said. I remember we cauld edit karma value before, where is it?
That was changed about the 2.20 version. so after this "improvment" all on the prievious written scenes work not as intendent.