I don’t have any of these add on cards available nor any experience with them.
You could try and see if you see a change in any of the unspecified registers in the address map that maps your setting. If that’s not the case then ThermIQ can’t do much about it since it only has access to the main computers registermap.
In general it’s easy to add or remove a value from the graphs but the registers Curve 2, min, max are all writable register to store a fixed setting and would present a flat line in the graphs. See if the value in STATUS1, STATUS2 or STATUS3 could be connected to your card.