RE: Thumb or finger fliers?
Before you get the tray, try this... make your neckstrap as short as you can and still get it over your head. Get the transmitter up around your breastbone. When it's up that high you can rest your hands on the sides and it will be stable. Your ring fingers and pinkies will be free to work switches, you will not need them to stabilize the radio like you do when it's down low. It also helps to make your sticks as long as you can when you do this.