You mean all those by players? I THINK I still have a forum thread detailing that though its probably not very up to date. I should have a document with all player LE/SE/Titan designs somewhere or other.I don't remember all SEs are player's design...
Don't see why not. We have the Rosmeriat event and it's connected SEs too. That could well see an update.We can also suggest making a quest-related SE like The Shadow Chancellor
Not sure about every 250 levels as such but more high levels, sure.I would like to see a new SE every 250 level content and pretty sure many EOC or high-level players are interested in seeing more SEs
~ Grim