Good news! Found what's causing the trim problem - having forcefeedback=1. Not sure how (natch), but switching FFB off (which also, according to the notes, affects joystick trim) immediately returns the keyboard fine trim functionality. Bit of a pity if you have a FFB stick, but since I don't, I'm content. Screw you plutocrats, with yer fancy FFB joysticks and yer gold-plated pedals!
