Not ATR but Saab 340 - also has 1/2 bank mode. Can be used most of the time but you have to remember to take it out for holds, approach etc as these are based on rate 1 turns. I have never found full bank to be uncomfortable in the back, we normally use 1/2 bank for initial climb/engine failure and if climbing at below approx. 1.4 Vs (I think), then get rid of it as it's a bit of a pain after that.