I have a UCD 46 and use a computer radio with the ailerons set up to move together controlled by a slider. I can move the slider up and raise the trailing edge of both ailerons from 0 to 1 cm or lower the slider to drop the trailing edge up tp 1 cm. I have all of my 3d planes set up to adjust the TE similarly. I did this to allow me to raise the TE a few degrees hoping to reduce wing rock and stabilize harrier flight. The results are subtle, not a lot happens when the TE is raised a little. The most noticable effect is a decrease in lift. Currently I do as Tony says, set it so it looks centered and fly that way.