[horde] Horde initial application

[garnier@embratel.com.br]

Hi

I´m trying to configure IMP (4.0.3) as Horde (3.0.5) initial application.
I´ve already changed $_prefs['initial_application'] on
horde/config/prefs.php to 'imp', but it didn´t work.
I´ve found that inside function _newSessionUrl (on horde/imp/redirect.php),
if Horde authentication provider is IMP (my case), $url variable is set to:
$url = Horde::applicationUrl($GLOBALS['registry']->get('webroot', 'horde')
. '/', true);

I changed this line to:
$url = Horde::applicationUrl($GLOBALS['registry']->get('webroot', 'imp') .
'/', true);

And it worked. Did I do anything I shouldn´t? Is there a reason why $url is
set to horde application, and not $_prefs['initial_application']?