[Typo3] File Ownership

[Sandy Matheson]

We run a number of Typo3 installations on the same virtual server and
need a way of managing disk quotas between these installations. The
server is a Linux host running apache and we have full shell access.

The setup of the virtual server allows us to set disk quotas against
users, but I cannot get Typo3 to use a specific user exclusively.
Typo3 writes files and folders as the 'web' user. I have tried setting
[BE][createGroup] but this seems to have no effect and folders and
files are still written as the 'web.web' user/group.

Is there a way of forcing Typo3 to write to a specific user?