I'm working with 3.2 ProcessBook trend with calculates or dataset and I find that has a limit of points each dataset. There is another way to have an unlimited amount of data in a dataset without having to upgrade the property maxValues in procbook.ini file?
The idea behind having MaxValues in Procbook.ini is to limit the memory footprint of a trend. This setting limits the maximum number for values for each trend before it gets refreshed. The only way I see you can affect that parameter is through Procbook.ini; I don't see it being exposed programmatically.