you had it right when you realized that nobody "in the know" on this sort of thing will give up any info.
Having said that, you really need to be more specific. Do most of the funds trade in the same type of "style"...yes and no.
In each ag market (grains, softs, meats) you have some that trade a larger macro style than others, whether it be for longer term hedge or directional bias, you have others that are the traditional "trend followers", and you have those that only deal in futures as a delta hedge to options trades.
As with the different general styles....there are as many "ways" these guys trade as there are traders....and it is very dependent on the market you are in. The fund traders do not trade the same way in the corn and bean pit as they do in cattle or hogs, just due to the way each of these markets are structured. Added to that, most of the guys who trade for these funds have their own personality and style...which is becoming less of a factor now with most of the volume migrating to the screen.
Finally, you need to realize that you not only need to watch the funds, but equally as important watch the commercials...or in the case of non-self clearing commercials (Cargill comes to mind), watch who they clear through. Commercials still carry (imo) more of an actual influence in the ag markets (except when roll time is concerned), as far as directional flat price trading is concerned. (and to a bigger and bigger extent each year in the spread market as well)