Is it possible to merge maps with MCEdit? I've grown rather attached to the world I created to play with the pre-release, my island even has a working lighthouse on it, and I'd like to add the region to my main world if possible. I know there'd be horrible chunk errors, but I'm going to have those once I start exploring anyway.
Yeah, you can do that. MCEdit lets you copy and paste chunks between maps, I'm pretty sure.