DeskScapes 3.5 would allow you to run a dream on seperate monitors at different timings and the newest version will not.
The video you are pointing to was created before DeskScapes 8 came out so more than likely 3.5 was the version they were using.
There is a way around this so you can do what you would like to do... go to your extracted dream file directory and copy the enterprise 2.2.mpg file to your desktop, open deskscapes and drag and drop the file into the program. This will give you two to choose from and set individually to each monitor.
In Win 7 the extracted files go into the following directory... C:\Users\All Users\Stardock\DeskScapes\ExtractedData