Just that I recall looking over the heads of crowded standing room only trains!
I'm only 5'10"
I remember getting hammered by umbrellas on crowded sidewalks in the rain too! Over their heads was in my face!
I don't think 5'0" is any kind of problem, But I would love to lower the seat, so my head would be off the roof and not hit the top of the door frame when I turn my head.
I remember the lower the seat thread. He cut the back seat rail mounts so he could flatten the hump out. I thought he cut the front seat riser too, but I don't remember.
I'm betting Ldub has already posted the link while I typed this.