I don't think there's a way to configure what you want, however you can use e.g. the OnFocusChanged
event and invoke the edit mode manually with a code like this:
procedure TForm1.VirtualStringTree1FocusChanged(Sender: TBaseVirtualTree;
Node: PVirtualNode; Column: TColumnIndex);
begin
Sender.EditNode(Node, Column);
end;
The problem of the above workaround is that the edit mode is invoked even if you select different node by keyboard, which may not be exactly what you want.