Please don't discuss pre-release features outside the pre-release forum. Even though you understand the difference between pre-release and full-release versions, not all users do, and regrettable misunderstandings and confusion have resulted in the past. Its so easy to avoid; just keep the talk in the pre forum, thanks
Please note that any feature that appears in a pre-release version might appear in its current form in the next Reaper version, or perhaps in a later version in its current form or a modified form, or in a different form at some point in the future, or indeed not at all and never make it to a release version of Reaper.