For the P38, it is sufficient to have elevator trim easy at hand. The contrarotating probs neutralize most to all torque to the left or right.
On other planes it is very good to have all trims on the stick or i good range on the keyboard.
I think you can fly the P38 pretty much only with elevator trim. You ca still use the multiple autotrims to maintain climb, speed or level. Once you enter a fight, you should correct the nose up/down tendencies from speed changes with the elevator trim. Should work pretty good.
I personally btw find a somewhat noseheavy plane easier to fly than a tail hvy one. This maybe cause i can control the backmovement of the stick better than the forward movement. So i often have the plane trimmed for high speeds, so that in fight i generally get a bit nosehvy, but that i ca than correct easily wiht the stick.
