Actually you can run multiple telescopes with SGP now. I currently run 3 scopes on the same mount, taking images on all 3.
This is not directly supported at this time by SGP.
However, you can run multiple copies of SGP and control 1 camera with each instance of SGP. But there is no communication between the multiple instances of SGP.
The primary instance of SGP connects the mount, determines what targets are imaged for the session, connects the guide camera, and controls my SBIG 8300M.
The other 2 instances each control a Nikon 6D full frame DSLR with no mount or guide camera. Those just continually take images one after another for the duration of the session.
The image being taken by these other 2 cameras during the slew from 1 target to the next are trash, but not a big deal for me since I get a lot of color images while the main camera is taking all its different filter images. Plus all the images for each of these other 2 cameras are stored in the same folder.
Obviously, this is not the ideal solution, however, it works for me as an interim solution until the next release that supports multiple scopes.
And I do not dither, since this would screw up the other 2 cameras. My flats appear to deal with this rather well.