At the moment I am perfectly fine with the version as is, as I am using a mixture of HARP with the RM2/Classic Combat System. I would therefore need three Resistance fields or have the three fields customizable in name, so that I could use them as I see fit. A fourth field, however, would be nice, as I would probably go for Perception, RR Stamina, RR Magic and RR Will.
All in all, and I may have stated that before, if not I should have, this is a really great tool!