As a pker, it gets annoying when players tend to block staircases to get an advantage and it just clogs up the area. Barely any space to move and you're hit at all directions once that occurs. Any fort that has a path leading to flag, guilds tend to initiate a blocking strategy. Most commonly the ones mentioned in OP and also Deadwood. I wish they fix the glitch that Castle has at the stairs, if it is I don't notice it at all.
Mod Suggestion: Make 2 staircases instead of 1.