That is coming soon. Now that beta has started, I will be focusing on getting the in-game editing tools completed and fleshing out the wiki documentation on how to mod and run your own server.
If there is anything in particular you would like to know how to do, I could try to get that handled before the others.
There are several ways, including testing the server admin / GMing side of things, wiki content, writing MODs (which will need some work from me first on doccing the APIs) etc.
Is there something in particular you would want to help with?
Perhaps you could lend your pixel art skills towards making icons (the default icon size is 32x32, I'll include the default set below) for some of the new items they are suggesting. I think it would be awesome if you three were to collaborate.