I, too, seem to have farmers who want only to harvest coconuts, both when fish are available pre-algae, and when crops are available. Of course this is frustrating, as I would like to use the coconuts in a similar fashion as the berries from VVI, to fill gaps while crops grow.
Along the same lines, you are not able to grab a villager off a coconut tree during climbing. I'd like to have the ability to stop their annoying harvesting midway up the tree just as you can any other time until they get the coconut in the bin.
Finally, in VVI and VVII, if you gather all your villagers in the crop patch just as the crops are about to be exhausted, they can all take in a full bushel, so long as they don't shake their head, and they start harvesting before the first villager reaches the bin with the last of the crops. I like this "cheat," as it rewards those who are not time traveling or away from the game. Nevertheless, I have always been curious if this is purposeful or not.
Miscellaneous: I changed villagers names, but the genealogy does not change... will this resolve in time?