Most of your solutions have been lying to the camera and will not solve the problem. I think you have to remember that any exposure is determined by three factors: The lens opening or f stop, the length of time of the exposure, and the sensativity of the film or film speed. (The most important factor of course is the available light itself, but that is mostly beyond your control. Of course you can wait until later in the day, or only shot when there are no clouds, or use a bigger flash, etc.)

If you want to change the equation in some way, such as by shortening your exposure from 1/30 to 1/60 you have to change another factor by the same amount in the opposite direction. You have to increase the film speed, in your case from 200 to 400. You can buy faster film such as ASA400 or you can ask your lab to push the film 1 stop. (personally I prefer to use faster film, but that's another story)

You can also open up your lens more. Go from f5.6 to f4. Oh you say, My lens only opens up to f5.6. Well, that's why we Nikonians spend so much time talking about what lens we're going to buy next.

Occasionally we have to accept that there are some pictures our cameras can't handle without change. Bigger lenses, faster film, a different time of day, acceptance of a blurred image.

The camera is not as good as the human eye.