Enabling magic quotes and sybase quotes for just one domain on a virtual server

Hi, I got a linux server with many domain names using PHP and various Database. Theses applications exists and were developped with this settings in php.ini :

magic_quotes_gpc        = Off
magic_quotes_runtime = Off
magic_quotes_sybase     = Off

Now for a new application using a sybase server, i need having these settings :

magic_quotes_gpc        = On
magic_quotes_sybase     = On

The problem is that if i modify the php.ini file the other applications will go with many bugs ... So, is there a way to modify theses parameters for an entire domain name, i've notice that it will be perharps possible in some messages, but don't find how to do this ... If somebody know how to do this ... Many thanks for responses. Best regards, Alain DESEINE.