For RN, specifically using Hero crew:
Gunners, only consider reload gunners or you are wasting the Hero stats. You will only top out RN reload at relatively high levels, but you will have topped accuracy by ability before level 75. My Blitz 11/11 reloads are at about 85% accuracy at level 60. Putting a 14 base as gunner would have been a complete waste.
If you are going to use as RN AA gunners thay need leaving as armourment until they are near 100 or they will not come close to reload cap.
RN has good secondary Rep and Restore, but mediocre Engines. Hence, RN Heros would be brilliant. The restore cap is easy to hit with them (even on SS) and repair has a very high level before you reach the cap. Overheat SPEED will cap quite early but duration will continue to rise. Hence, good use for Hero is engineer.
Repair would be good, but you are wasting an Engineer base of 14 as engineer stats do not work unless classed as such.
Restore is a complete waste for any crew in RN
Pilot would help with 14 base in Air, Fighter or Bomb with help towards Restore and repair that most pilots would not otherwise provide.
So, basically I would class RN Heros as Engineers first choice, pilots second.