But if the rigging is 'off', that would result in a discrepancy between the wheel position and the ailerons. Given an aircraft with a straight frame, the control surfaces being in a trimmed position would result in straight and level flight. But that's not what Hobo described. The control wheel would have to be held off center to achieve a faired trim given a rigging problem. Similar to an auto's steering wheel being out of line to hold the wheels straight ahead. But wheels straight would still result in a straight course.
There could be some other mis-adjustments at work here (in Hobo's case) to require ailerons set as observed. A flap on one side not fully retracted (symmetrical with its opposite) for example might require a compensating roll input to maintain level flight. Other aerodynamic asymmetries may account for this as well. Or a fat guy sitting on one side.
