[otrs] User backend

Hello all, I would love to be able to change the user backend from otrs to my own db. The manual states that this great feature will be awailable in otrs2.0. Is it so in the current BETA2? The reason is that i'm trying to integrate zabbix (www.zabbix.com) and otrs. So far I've been able to merge the user and group tables but the problem with this approach is that i break compatibility with otrs. So a couple of hints on how to do this by using a different user backend (not only user auth-backend) would be appreciated :) I read earlier on the mailing-list something about copying the Customer User backend. But didn't quite get it. All pointers are appreciated! regards - safl