pilotis?? you still around old friend?
i haven't seen any posts from you , happy thats your here
and yeah, my baby will never die , i love it too much.
ok the expanding city,
4rd tile is only available on the last culture level, and 3 is available only at the one previous to the last.
i left 2 tiles for most culture levels so cities will take time to get 3-4 tiles, and not on mid/start game.
if you wanna make sure it works - just get into the world builder, edit the city - give the city 99999999 culture - and you'll see that 4 tiles are possible.
have fun,
hope youll have some feed back
p.s,
if you like to change the settings, just go to civ4culturelevels.xml under xml\gameinfo
and change the lines that says city radius.