php4: less config variables

Hi all, I am very frustrated: I have been running php3 for 4 months and I was used to some configuration options that were secure for several users to put their php pages on their site. In particular, for each virtual host, I put php3_open_basedir in a directory tag in httpd.conf of Apache, so that the user cannot change directory out of his own part of the server. Yesterday I installed PHP4, and here is what I read: " With PHP 3.0, there are Apache directives that correspond to each configuration setting in the php3.ini name, except the name is prefixed by "php3_". With PHP 4.0, there are just a few Apache directives that allow you to change the PHP configuration settings. " And in these "few Apache directives", open_basedir is not ... This means that I have to put open_basedir in the php.ini file and I cannot put a different value for each directory ? Did somebody have the same desillusion and maybe an alternate solution ? Thank you, Estelle