Hi Gav, there is not any proper script API documentation, but there is a list available of all the properties and methods that are available to scripts.

For that check out the moi.idl file which is linked to from here:
http://moi3d.com/wiki/Scripting

It unfortunately takes quite a lot of effort to document an API, currently I'm more focused on documenting and generally working on the regular tools and UI and stuff like that instead.

At some point in the future when the more "regular end user" toolset is more refined, then I'll probably be able to spend some effort on scripting and API level documentation and support.

- Michael