In regards to steering assist, I've noticed, if it was active previously, it stays active even if the car slows to almost a stop (way below 30 mph). It will stay on even if crawling in traffic. It then turns off if stopped for more than a couple seconds. It does not appear to reactivate when resuming speed, at least until it reaches past a certain speed and it redetects the lane markings.
I've compared the overall behavior of PP versus a M3 AP, and it does appear the M3 somehow is able to detect very faint lane markings better. But PP is definitely more forgiving when providing steering input and does feel more natural. Either way, if they are able to improve the PP software, that would be great, but I have not read anything indicating they would do so...yet.
2018 Leaf SV - In Service 2019 January - Location: Raleigh, NC.
2013 Leaf SL - Original In Service 2013 February - Bar Losses: 2016.10.17 - 25,843 Miles -- 2017.06.23 - 32,080 Miles -- 2018.04.10 - 37,000 Miles -- 4th: 2018.09.23 - 44,255 Miles