[CalendarServer-users] ACLs in new configuration scheme

Hello everyone. I've just succeeded in setting CalendarServer on Linux with a Sunbird client. (i'd be pleased to put a mini-howto somewhere in the wiki. how ?) I'm able to define users who stores their sunbird calendars on CalendarServer. But i can't understand how to define ACLs for sharing between users. I've read in this ML that standard DAV methods could be used for setting ACLs (but there is no practical client). I also read some instructions how to define them in configuration files (when repository.xml was used). What i need is some up-to-date instructions on how to set ACLs in the new configuration scheme. Thanks.