Well I have just inserted the right 'program changes' in the begining of every miditrack. I press play and the Virus is set up using these PCs. The only thing I have to do manually is to set it in Multi-single mode. But it's there all the time anyway, so that's no big deal.
I'm not sure why you would want to load a Multiprogram (except of course if you use layered voices, which I asume that you don't (please correct me if I'm wrong
)).
If you don't use layered sounds, I wouldn't spend so much time on the Multi-mode when Multi-single is so easy to use: you just have to load your singles in the begining of every track(/midi-channel) on your RS7K (I WANT ONE OF THOSE!)