[AH_Moggy]

...As far as I can find, it didn't have trim controls...

Actually, the B5N had trim controls for all three axes. In the photo (from a "Kate" captured at Aslito A/F on Saipan in '44), the aileron & rudder trim controls are far left (the aileron trim is the knobbed lever; the rudder the more conventional nubbed "wheel" type). Unfortunately for the pilot, the more-often-used elevator trim control was higher on the port side and more difficult to access. You can just see the lever for it in the extreme upper left of the photo.

I would add my plea for this plane to be added in the "new slot" category. It was the most important IJN carrier-borne attack plane of the war, in that the Japanese put much more stock in torpedo-bombing than they did dive-bombing ships, and no other later IJN torpedo-bomber had much impact on the already-lost war. (And, my shoulder gets pretty sore after flying it for over an hour, with the constant "down & right" stick input needed to keep it in the air )