IMHO, adding the J2M would fit the "nice to have" category, rather than "needed". Only around 500 Raiden (Thunderbolt) were made, slightly more than half of them (~ 260) the J2M3 variant. At a wing loading of 171.3 kilograms per square meter (~ 32.8 pounds per square foot) I don't know that I'd call the J2M3 "nimble", but I agree it would be nice to have.
bino <- still wishing for the Ki-43 in the SEA's