Unicable multi-user "solutions" require special transponder lists to work, as many transponders have different frequencies there, and polarisation or band or position switching is not available there.
You will have to create such a file on your own, and that requires quite some time and knowledge. Or you have to use blind scanning, that may take a whole night...
And you will never get more than around a third of the transponders on a position this way.
BTW, ProgDVB can't be changed to handle this alone, as there are quite some different varieties of unicable "solutions" around, always adapted to local situation and needs. But ProgDVB is meant to work world wide.
If a receiver a manufacturer implements such to a device, that one can only be sold in one region.
And in most cases that's only compatible then with special LNBs of the same brand.
Not really a solution
That's quite similar to the stupid band stacking "solutions" some American providers and land lords use, to save some pennies on LNB cables and switches...