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You can add additional lot sizes to the world editor using this mod:
http://www.modthesims.info/download.php?t=471164
64x64 is still the max, though.
Edit world mode only allows you to place new lots on routable terrain... which means it will STILL be hard to find a place for a big lot in a town like Sunset Valley, even if it looks like there's a lot of empty space, since a lot of the terrain is designated as unroutable. However, if you don't mind bulldozing a couple of smaller lots you might be able to place a larger lot in their place. Placing lots in the World Editor is... kinda fussy though