There isn't a way to log two amps outputs. But if you're looking for a way to show two amps on a display, you can use a shunt plus a GRT CS-01 or CS-02, or to of either of the latter. The GRT sensors are supported on different pins.
Not quite, but same effect (second amps probably doesn't log). Certain sensors that the system considers special (like amps) don't log when there are multiples of them. I don't believe that that logging behavior has been changed.