I fly an unpressurised twin turbine, my normal track to my home airport is pretty much on the Loc for the main runway. normally the controller wont let me descent from my cruising level FL70 25 miles so im pretty on slope at that point. So if i maintian 220 kts IAS to 6 miles im gonna have a RoD of about 1300ft which is normally ok since im on my own but occasionally i have 9 PAX so i slow down. Travel slower RoD reduces. By slowing down 60 odd kts its going to reduce Rod to closer to 800fpm. Going to take extra 2 minutes to get on the ground, oh well, if controller wants to know why you have slowed down and stuffed his pattern let him know.
By the way QSY is used quite a bit up in scotland, the bond guys use it all the time