Here is an example:
http://fantasycities.watabou.ru/?size=15&seed=1279697557&hub=0&random=0&citadel=1&plaza=1&temple=1&walls=1&shantytown=0&river=0&coast=0&gates=0
This should produce a walled city without gates (gates=0 in the end). After "submitting" a url the gates parameter is removed from the url - it's the intended behaviour.
Thank you. However, can this also be added to the Options part of the menu?