Okay, I've already posted something about this, but since I got no response, thought I'd try again.
P-47s-You can manually input full nose-down trim, but hitting the key to trim elevator nose-up does nothing.
P-51D, P-40E-You can only manually input about half the range of nose-down elevator trim. However, using the shift-X key in a dive, the combat trim will still input the full range of nose-down trim. And the manual nose-up trim key still does nothing.
Aileron and Rudder trim seems to be working normally. What is going on here though?
Will test more planes for these oddities.