Hi crythias and everyone.
I'm new here, this is my first post, and I thought I'd contribute first with a bit of knowledge before abusing the community and posting any questions.
I had this very problem, and I solved it in a somewhat different (and more complicated, but indeed documented) way.
When I added my external LDAP backend (AD, as everybody else), the Admin users on my DB backend were, of course, missing. If I added Agents to the AD group, they would have access to the queues, but not the Admin panel. I was locked out of my OTRS!
After some two weeks of scratching my head, I decided to go through the official OTRS documentation (for the fifth time?) and stumbled on the Using More than One Customer Backend with OTRS
section, available here:
https://doc.otrs.com/doc/manual/admin/6 ... kends.html
Now I have both backends working in parallel, transparently. I can add an Admin/Agent in my AD, for internal agents, and in the original DB, for some external agents that I need to have here. Both types of admins work simultenaously.
I don't know if it's illegal to link other forums here (sorry if it is) but here's one posting of mine on Server Fault, with the problem and my detailed solution:
https://serverfault.com/questions/96448 ... 044#969044
Hope it is of any avail to someone.