feedback with sidestick
What about having a screen or even better a small portion on the HUD (they are introduced slowly) that shows a rectangule divided in 4 quadrants with a dot showing where the stick position is. Add a RH/LH indication for where the input comes from and a 'Dual Input' flashing indication when there is dual input...
Something similar with what fighter aircraft/helicopters have in the targeting pods' screen to show where the sensor is looking compared to foward.
(I'm not a pilot)