It would be really great to have an option for front-end to auto-create users, perhaps even with a specific default group membership, if authentication is successful.
As a sample scenario, we maintain a large number of systems for our research groups. Often their developers, GRAs, etc, would like to see performance metrics. Since they already exist in our LDAP, it would save them an extra step of having to contact helpdesk to get an account created on the zabbix system.
Looks like this was previously tackled by user patches, but they never made it into the mainstream: http://www.zabbix.com/forum/showthread.php?p=97805