EA games removed some "tools" from their own version of CAW to release it for the players.
For instance, if you look at Twinbrook or Bridgeport closely, you'll see that all that water areas in those worlds are not on the same level. I'm not talking about ponds built on lot, but the really large water zones. Example: the central lake of Twinbrook is higher than the swamp waters. This is something we can't do with the public version of CAW, but the developer's one has an additional tool to design easily those different water planes. This opens up many possibilities for world creators.
Another easy example: you can place a lighthouse in CAW (the one from SV), but the special effect of the light beam is not available. So, player made worlds have dull lighthouse
. Talented CAW users had found a way to add this effect, but it was really tricky. Now, it's available like other effects in the dev' tool.
A last example, not all the objects that come with an EP are tagged as visible (and placable) in CAW. They seem to be all there in the dev' version.
It's hard to explain it much more. Go download CAW and try it
, it's as fun as the game itself, although a tad little bit more time consuming.