Can you edit the EA worlds as they appear at the start of your game? That is, I've been wondering for a while, and it would be a much more accurate way of pinpointing spawners on a map if you looked at them in CAW. I assumed they would show up like the boxes do in buydbug, and if I could get mine to work (it never ran when I downloaded and I'm not in the mood for troubleshooting EDIT: I saw the post about changing the version numbers and that is nice and easy. I wasn't in the mood for reinstalling, and glad I don't have to!) I would go through them myself and do maps for the other towns to update the guide (someone else has started on that project now though).
It would be handy to know how many of each type of spawner each different map has, for balance sake when creating a new world, and even for play strategy. If a certain map has more of a particular spawner (ideally the high ones, like pink diamonds, rainbow beetles/butterflies, special seeds) it would prove to be a strategically better map to use for certain challenges. I've played sunset valley enough to be able to pinpoint most of the exact spawner types now anyway, but that's what puts me off playing the newer maps: working out where all the spawner points are.