VirtualHosts on mysql, now I need to support a certain directive

[Moreno Gentili <brightsoul@xxxxxxxxxx>]

Hi everybody,
I'm trying to bridge the gap between two apache modules.

• mod_vhost_dbi from outoforder.cc, which allows me to store virtual hosts on a mysql database.
• apache2-mpm-itk which allows the assignment of a different user/group to each virtualhost.
  

The problem is that apache2-mpm-itk requires a AssignUserID directive in each VirtualHost but mod_vhost_dbi doesn't support custom configuration directives.
I'm looking at mod_vhost_dbi source code to see if I can modify it to supply a value for AssignUserID but I'm starting to feel really lost.
I tried adding the key-value pair to the request_rec->subprocess_env table but it didn't work and I can't really say I know what I'm doing.
Any idea on how I might feed that value to the other module? Which hook should I handle and which function should I use?
Thank you in advance.