Theme Adjuster in Reaper 5?

Hello. I am running Reaper 5.9xx in Win 10. I was looking thru the User's Manual (and I believe I am looking at Ver 6.x of the Manual) and saw about the Theme Adjuster, and I thought I would check it out. The User's Manual says to open the THeme Adjuster, go Options->Themes->Theme Adjuster. When I do Options->Themes, my available menu options are then Default, Reaper 4, and Classic - there is no option to open the Theme Adjuster. Is there a Theme Adjuster for Reaper 5? If yes, how do I access it? Thx

In 'Actions' look for "Theme Development: Show theme tweak/configuration window", you can assign what key you like.

Theme Adjuster (as in the window that allows for general hue/saturation and layout changes, not the simple Theme Tweak) only appeared in V6. Not sure it can work for V5 at all.

The Reaper functionality that the Theme Adjuser makes use of (script control of theme parameters) was added in Reaper v6.0.

Theme adjuster 5 coming soon. 

Will be doing some final edits.

Reaper 5 with theme adjuster is available in the stash.

The Theme Adjuster is a ReaScript like any other, and requires nothing special to run. The Default 6 Theme is a Reaper theme like any other, and requires nothing special to run. To work correctly, both require Reaper v6 or later.

Why is it an issue? 

If I want to take an element from reaper 5 default theme and put it in the reaper default 6 theme, that's no problem. BUT Running the default reaper 6 theme including the theme adjuster in reaper 5, before you say impossible, that's not true but it is treated like the crime of the century. Why is this?