Stopping the trim wheel with your hand will definitely take a couple layers of skin off; using the bottom of one’s shoe works pretty good.
It's a 50 year old memory, but the BAC 1-11 had large trim wheels for the T-Tail which had a 3 degree slack in the movement to temporarily cut out the Mach Trim. This slightly annoying hysteresis had light springing to actuate the cut-out switches, akin to strut micro-switches.
What I would like to see from Boeing, is a pair of wheels that have a similar, albeit a bit heavier, sprung region - which cuts out all power to the H-Stabilizer motor/clutches as soon as you grab the wheel.