A simple magnet on my vent flap eliminates all your concerns, and it's very easy to use.
I replaced the thermistor and then ran a cycle on permanent press. The load dried properly with no problems. I then ran a load of a couple of towels on the towel setting, and the dryer shut off before the towels were dry. I then set it to permanent press, and it still shut off early. I then set it to knit/delicate and had the same results. I ran it on air only. Some moisture left the towels, and the dryer cooled down. I then attempted the knit/delicate cycle again. It ran longer, than previously, but still stopped early. I ran it again, and the towels were fairly dry.
It appears there are 4 other parts that might be causing the problem (unless the new thermistor is defective).
Sensor – Pressure #3407033
Electrode, Sensor #3387223 (possibly moisture sensor)
Thermostat (high limit 205°F) #3388697
Sensor, Radiant #338906
Since the dryer does shut off when hot, I’m sensing it is probably either the Electrode, Sensor or the Sensor, Radiant, as there is nothing I can see that might raise the pressure, and the dryer does get hot. What are your thoughts on this?