Changing the number of next dates to 16 should not be too hard. I’d like to add it as a configurable option in the configuration screen (new in Foodsoft 4.2.0).
At the moment, I don’t really have much time to do Foodsoft development; neither have I touched much of the tasks code. But perhaps I’ll find some time somewhere this year.
To keep track of this, I’ve opened an issue at https://github.com/foodcoops/foodsoft/issues/324 Please feel free to add comments there as well.