A whitelist for depth buffer access in non-problematic online games would be a great addition. For example, I imagine just about every MMO would be fine (and is probably the primary source of threads regarding this limitation). I don't know how much of a bear it would be to implement with the current code, but surely it's possible. I totally understand if it's an issue Crosire doesn't want to touch with a 10 foot pole.
It's a bit frustrating not being able to get depth access in a 20 year old game running on a private server (PSOBB)