I've already come up with the stairs one on my own, so I won't credit you for that. It's not like you made an awesome event thing or anything there. I would categorize that as an event snipplet, because anyone with any event creating exp can make that system. I'm using it in my game also, but I'm not gonna give credit for that particular event system...Everything else deserves credit though, andif I use them, I will give you that credit.
I'm using the same system for bridges, ladders, and stairs alike...That's why I won't give credit.