If I can remember to, let me try to set my garage switch trim tomorrow when I won't disturb people. I cannot remember if the light goes on, stays on, or what when doing this.
I think the basic procedure is the same as the lamp module. Unfortunately I don't have the lamp module to test the behavior, but maybe this procedure will give some insight as to what their other products do when trying to set trim.
Tag me in this thread tomorrow if I don't post the results of this test to remind me.