looks like there's no way to allow edits for everyone with the link, they can only view the document that way. guess it's Google Docs for me for the foreseeable future :(
also, it doesn't seem to support previewing .odt, while .docx works fine.
yes, like your quote says, you have to invite other users. you have to explicitly add every user's email in order to let them edit it, you can't just create a link and send it to people.