setting allow_call_time_pass_reference to true

Hi there, I am working on a webservice with a xmlrpc class of Keith D. It workes nicely, but it generates tonns of error msg into the error log file. Telling me to set allow_call_time_pass_reference to true. As I do want to set it only true for one directory, I would like to put it into a .htaccess file. I tryed: php_flag allow_call_time_pass_reference on but this does not work, I have to switch it off in the php.ini file, but this is exacly what I do not want to do. Can anybody see why this is not working with the .htaccess file? Thanx in advance, Merlin