Zodiac, jailed for the escape button.

[James]

I don't know if you already have a log of people that are pressing ESC in dungeons, but you could script something that detects the people that do it more than "x" times and put them in a separate log. Also have it search the entire party and find people that commonly are in parties that abuse it.

Whatever you want to do them is entirely up to you, but I'd bust out the mighty banhammer, or threaten them with an account reset.