Wow, this thread woke up! In retrospect, I suppose "guiding force" does convey a certain predisposition I did not intend. I think of kamma (please remember I'm still in my rookie season) as an action-reaction sort of thing. With regards to the natural-law examples given, especially gravity, gravity is the byproduct of mass. They're directly proportional and immediate in effect. There is no lag from the existence of mass and the instantiation of gravity.
Going back to Individual's post, if you disregard the common view of a "lifetime", then things do become much more explicable. I guess I'm retaining the view that the end-of-life is the remainderless cessation of everything. If you take the position that "you" continue across lifetimes, then it's just a matter of waiting for your actions to ricochet around and get back to you, in whatever form they may take.
I am reminded of the "butterfly effect".
The butterfly effect is a term related to meteorology (the study of weather phenomena) and to chaos theory (a branch of mathematical and physical theory). A meteorologist named Edward Lorenz is credited with having given the concept its name. Basically the butterfly effect is the observation that an event as seemingly insignificant as the flapping of a butterfly's wings might create a minuscule disturbance that, in the chaotic motion of the atmosphere, may eventually become sufficiently amplified to change the large-scale atmospheric motion, possibly even leading to a huge storm in a distant place. The immense number of tiny variables is one reason why long-term weather is so difficult to forecast. The term "butterfly effect" is sometimes applied to areas outside meteorology, making reference to the fact that small, almost imperceptible things can have large and momentous consequences.