Come to think of it while it may have happened, I don't remember any sim session where a V1 cut occurred and the auto-feather didn't work. It would, however, be useful to demonstrate. I've done them in the airplane, but it was very light and there really isn't a power setting that did or could replicate 0 thrust and a unfeathered propeller. I've seen in the MEL takeoff without auto-feather and the weight/temp limitations are extreme, so obviously it is for ferry flight and no passengers/freight.
If you have to manually feather below 400 ft, it'll be busy, and by the time you are half-way through that you will be at or near 400ft and it'll become rather more busy with the accelerate/clean-up items.
I also agree about waiting after moving to feather before fuel cut-off.
The ATR, in my opinion, in many circumstances, can be a very high-workload airplane.