How define Startmodule by default?

Hi. How define the default "Startmodule" for new clients?

Example:
System -> Add User
Startmodule "sites"

In /usr/local/ispconfig/interface/lib/config.inc.php I define the default modules:
$conf['interface_modules_enabled'] = 'sites,tools';

Now I want define Startmodule = "sites".

Thanks!

 

Has found!
Edit file:
/usr/local/ispconfig/interface/web/client/client_edit.php

Replace:

$startmodule = (stristr($modules,'dashboard'))?'dashboard':'client';
to
$startmodule = ('sites');