Originally Posted by Ace4
FUNCTION menu, highlight the item to modify (T1-T4) and press Return, then you can modify the "rate" of the trim. Default is 30%, if you go down to 0% your trim will have no effect on the Function anymore. Keep in mind if you currently have 5 clicks of trim in a channel and you change the rate from 30%, the surface will no longer be at the "trimmed" position if you don't adjust the amount of trim.
Sorry to jump in here, I just want to make light of a simpler way to adjust trim step. The problem with doing it that way is exactly what you said, you will have to retrim your plane. The purpose of trims steps was to allow you to get your trims "close" by having a higher step and therefor you wouldn't have to click the trim as much while flying. Then you can adjust the trim step down to fine tune it without loosing your current trim setting.
Go into the linkage menu and go to the second page. Then scroll down to T1-T4 SET. Then drop the step on T1, T2, and T4 down to 1. (Default is 4). T3 is throttle so no reason to adjust the trim step on that.