Unit scopes about i-pascal HOT 5 OPEN

The "Unit namespaces" setting in SDK settings is exactly the feature you are talking about. It's not included in autotests yet but I just tested manually and it seems to work.
What version of Delphi and for what architecture you are using?
What RTL directories did you set in Delphi SDK? One with sources or with .dcu?

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ok I didn't have all required directories included

I have in unit namespaces Data.Win;Datasnap.Win;Web.Win;Soap.Win;Xml.Win;Bde;Vcl;Vcl.Imaging;Vcl.Touch;Vcl.Samples;Vcl.Shell;System;Xml;Data;Datasnap;Web;Soap;Winapi;System.Win

but still not all of them are working, it looks like the order is important

e.g.

uses
  Windows, Messages, Generics.Defaults, DB;

when I use Winapi;Data;System; Generics.Defaults can't be found
when I change it to Winapi;System;Data; Generics.Defaults & DB can't be found

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Fixed in v2.50

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it's better but still not ok

unit Test;

interface

uses
  Windows, Messages, Classes, SysUtils, Graphics, Controls, StdCtrls, Forms, U_ParentEdit, DBCtrls, DB, Mask, Buttons,
  JvComponentBase, JvComCtrls, JvExMask, JvDBControls, TB2Item, PrnDbgeh, DPControls, DPDBEdits, DPEdits,
  JvToolEdit, ExtCtrls;

unit Windows (WinApi.Windows) is in C:\Program Files (x86)\Embarcadero\Studio\20.0\source\rtl\win

unit namespaces
Data.Win;Datasnap.Win;Web.Win;Soap.Win;Xml.Win;Bde;Vcl;Vcl.Imaging;Vcl.Touch;Vcl.Samples;Vcl.Shell;System;Xml;Data;Datasnap;Web;Soap;Winapi;WinAPI.Foundation;System.Win;FMX

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when I try System;Vcl or System,Vcl it seems to not be working

It was working for me in 2.10 but no longer in 2.50.

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