Wow, if this is as good as it looks, I suspect I'll be using it quite a bit in the future, especially once it gets a brush engine!
This one is great since it allows for in-editor previewing of "weird" ideas, I know I've re-invented that UV-mapping workflow shown with the skeleton on the page once for a game-jam and wanted to use it but skipped it in the end since asset-creation was "annoying", having support in an editor to preview it easily can be a game-changer.