Denis, here is what I do, and it gives the user the option:

[Tasks]
Name: "desktopicon"; Description: "Create a &desktop icon"; GroupDescription: "Additional icons:"

[Icons]
Name: "{userdesktop}\Staffing LogBook"; Filename: "{app}\os.exe"; WorkingDir: "{app}"; Tasks: desktopicon

>While installing my app can I add a shortcut?