The Dread do run warm/hot. Not really an issue unless you're bothered by the heat.
The triggers are pulse triggers, not constant DC. There is a fix for it, but I cannot remember it at the moment. I have had a dread in a while. It's some sort of Xantech box that does a pulse/constant conversion. It sounds complicated, but once I made the piece, it was rather simple.
Make sure the Casablanca sends a pulse trigger signal, otherwise you need the "conversion" box.
On the surround/stereo issue, there are switches for each channel to assign the module to the appropriate bus.
I seem to remember a mono cable might not work...but I cannot remember.