RE: the shakes
I would agree with Divesplat on the transmitter tray. I use to fly with a friend who had a stroke. One of the side effects was the "shakes". Through trial and error... he found that a transmitter tray with soft pads glued on both side really helped out. By not holding the Tx, the weight of his hands resting on the pads would dampen the movement (shakes) and make flying more enjoyable for him.