Grease up all the line area in the wire cable that will pass thru a pulley or corner, make sure the pulley is on a proper angle. Putting connections on the ground is better having them on top of the activating door but make sure you cover the lines with pvc pipes and don't tangle the shooter. This causes shooters to fall forward because of the forward momentum yet they can't make a step to brake themselves because of the barrier. Just put a big prop behind the door to visually remind them. Fault lines on doors are not needed unless for safety reasons.
Doors are better off and safer being opened towards the shooter rather than being pushed thru.
I have seen a shooter that smashed to the door because it didn't open and subsequently broke 180. More than 2 creates bigtime problems and unwanted delays, not to mention bigtime irritation towards the stage range officers and shooters. If you want a shooter to shoot thru a window make sure it is wide enough for Rosey to take a peep, tall enough so that a 6.2 footer shooter won't have a backache, and low enough for Chepit to hang his arm over it. This also avoids brushed elbows and shoulders. Never put targets close enough wherein a shooter can almost kick them.