I fly the 727 as well and I find the main elecric trim issue inexcusable. I can never get the trim set correctly when using the main trim on approach. There should be 2 different speeds on the main trim as well. When the triming nose down and the trim is between 0 and 1.5 units the trim is automatically transfered to the autopilot cruise trim motor. A nose up trim input switches bac kto the main trim motor. There is only one speed modelled.