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OK, here are my final findings.
You can tell Toast that you are burning a BD by selecting that disk format, rendering to a disk image instead of a disk, then mount and burn the disk image in Toast as a DVD. Works fine. However, my settings of 18 Mbps average/22 Mbps peak caused skipping on my Sony S-350, and the menus still don't work, so there is really no point.
I went back and looked at the file sizes of the disks that Toast makes in "default" mode when you tell it you are burning a DVD instead of a BD and it works out to almost exactly 15 Mbps, which seems to be the safe top end of what the blu-ray player can handle (I expect the true limit is player-dependent and somewhere between 16-17 because my machine was only skipping a tad at 18). So much for the ~3x DVD speed spec!
However, this was still a good experiment because I know the approximate top end on the bit rate, and I also discovered that the, while the Toast manual controls don't do anything in DVD burning mode, they do work in BD mode. I can only assume that the "don't re-encode video" selector will work if I tell it I'm making a blu-ray. I may try that at some point for fun. Maybe the slow Compressor-originated version of AVCHD will look better? As it is I have spent 3 days rendering, burning and evaluating. I have shared what I learned in hopes of saving someone else the hassle. I hope it's helpful to someone.
Jonathan
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