I suppose the leader of the council could be titled a mayor, although Ned Shakeshaft is an odd choice!
I plan to do a search of the Keoland Yahoo site to see what references there are to Saltmarsh, Seaton, and Burle in old posts sooner or later. I'll take whatever scraps of info I can get!
The only info on Burle that I can recall is that it's bigger than Saltmarsh and has a temple to Pelor (I think).