[Marc Dantzker] ” If so, can I be sure that the resulting disk will be to spec and thus play in all set-top blu-ray players? It is critical that, when I send this to my customer, that it be compatible with his system and I cannot test that upfront.”
Burning Blu-ray to DVD media is definitely NOT up to spec in any way, shape or form.
If you want player compatibility, burn to a Blu-ray disc from Encore. Even then, some BD players are not up to date on firmware and will not play back burned BDMV without an update.
If you want the widest compatibility, look at Blu-ray replication, such as authoring in Sony Blu-print or Sonic Scenarist, and then having the Blu-ray professionally replicated. Be prepared to spend quite a bit of cash.