Interesting and, as you say, it may be due to the complexity of your layout. I've had a simple 2 switch system driven completely with the CSM2 for going on 2 years. I have not experienced the power up problem you referred to (having to start up CSM2 before powering DZ-2500s). Not sure why there is so much variability in these installations but I understand your frustration.
Again, the simplicity I have currently has not revealed any LCS App problems but yours does sound unique. Good test case to beat the kink's out!
Would love to bend Dave Olson's ear on CSM2 and IRV2 stuff. These are both critical to my plans. Luckily I have all the IRV2's that I need so its not really an issue for me; more of a disappointment.
Cheers!