In our case (146QT) the aircraft don't have the slide fitted, but we are permitted to carry grooms when we do a Horse charter, so I'm assuming that the slide is not a requirement, as long as the pax aren't paying as such. The living cargo is paid for, and the grooms are just there out of necessity.
That had better be how it works, or else we could be on the lookout for a few sets of slides........................
We can use the jumpseat for company employees, but are expecting a change soon.