imo a better approach would be to have trim tabs available on the flight controls (perhaps just the elevators to start with) that could be moved in steps up and down with two mappable buttons. so then trim nose up and trim nose down keys with a display of where the trim is at similar to the vectored thrust display.
imo a better approach would be to have trim tabs available on the flight controls (perhaps just the elevators to start with) that could be moved in steps up and down with two mappable buttons. so then trim nose up and trim nose down keys with a display of where the trim is at similar to the vectored thrust display.