!!! Yes!
This works! So using "Sort By Added" and then selecting models and using "Move Up" and "Move Down" to order them in custom order, and save, it seems it replaces the "Sort By Added" order in the "mdj" file with the custom sorting!!! And this "User Order" seems to also pass in HTMLDocs, solving my initial issue!!!!
That's Great!!!
[Bug]: By accident I noticed that when I have a flow chart and models, then the "Move Up"/"Move Down" for the FlowChart is fails!
See the attached "OrderHTML.mdj" file. Models 01..., 02... and 03... can change order - and this to be reflected in HTMLDocs - but if you try to change order to the "Flowchart1" regarding the other models (01..., 02..., 03...) it fails to move it! This seems more like a bug, and may also affect other kinds of elements too, so, if you want have a look at it.
Thanks!!!