Man, thanks for everyone's input on this. This one is a networked switch, tied to another Magix via a wireless T1, so I need to stay in Hybrid/PBX mode. The voice mail resides on the other, primary switch. Any dial 0 calls at this site really don't matter, as the "real" operator is also at the primary site. We're either going to get them to trade up one of their 4412-D's for a 4424-D (not LD), then I'll just remove the individual line apperances, and give it SA buttons, OR, reuse another of their Partner sets on the ETR board, leave #01 unequipped, and cover it to the Partner set for the "operator" calls.
However, it's been another good "gotcha" to watch out for, and warn the salesmen about.