windows - Alternative to TControl.Perform

Question

the TControl.Perform code is:

var
  Message: TMessage;
begin
  Message.Msg := Msg;
  Message.WParam := WParam;
  Message.LParam := LParam;
  Message.Result := 0;
  if Self <> nil then WindowProc(Message);
  Result := Message.Result;

The program execution awaits return, am i right?

There is an alternative, for posting a message in a TFORM queue, inside another thread, in the same Application, without waiting return?

EDIT

This approach could mitigate the problem?

interface

const  
  WM_DOSTUFF = WM_APP + $001;

TMyForm = class(TForm)
{stuff}
public
{Other stuff}
  procedure DoMyStuff(var Msg: TMessage); message WM_DOSTUFF;   
{More stuff}
end;  

var
  MyHandle: HWND;

implementation

constructor TMyForm.Create(AOwner: TComponent);
begin
  inherited;
  MyHandle := AllocateHWnd(DoMyStuff);
end; 

destructor TMyForm.Destroy;
begin
  DeallocateHWnd(MyHandle);
  inherited;
end;

And use normally inside a thread:

  PostMessage(MyHandle, WM_DOSTUFF, 0, 0);