Okay, that's interesting.
The stretch over monitors option only applies to static wallpapers and video dreams not dynamic dreams.
Dynamic dreams can already treat the entire space as a single workspace if they wish. Likewise video dreams can be stretched to fill multiple screens - just see the stretch over monitors and fill monitors background settings modes.
Which of these answers (both from you) is correct, then?
Saying that a dynamic dream can treat the entire space as a single workspace implies that it can be set to present a uniform display over the area defined by multiple monitors.
And if it is a fact that dynamic dreams currently cannot do this, it seems appropriate to state that providing that feature would be an acceptable answer to the question that started this post.
And, I'm not really convinced by the argument that providing these features are too much of a performance hit. How about we get the option, and we can choose to use the feature, or not, as we see fit?
So, that's my answer to your original question. Give us the option to allow dynamic dreams to treat a multiple monitor setup as a single space.
Or, perhaps, since the 'Desktop Ripples' dream is a Stardock premium dream, maybe it can be updated to better handle multiple monitors. Just a thought.
Deskscapes is still better than it was, so that's a net plus, but I'd like to see multiple monitors supported more fully.