As I use the route one or two time in winter. I agree; when you wait on line that a party came down, it is long.
As most client don't know to rap and the route is more a scrambling that people use to do with out rope, I am not sure that it is safer with or without rope. When the feet slip... you need a belay, not a rope who will drag you on the steeper ground. Learning to tie a sit harness with the rope and belaying the client with a rope is safer for me. To go up, make a top rope and down to the client can be more use full and faster too. So, the client will have to learn basic technique and teach how use full it is to know more about mountaineering. And maybe they will take a course of climbing.
As a fast climber, I think that the "ice flow" of people true the difficulty most be reasonable. A party with five people who have hard time most let skill people to go at a normal speed. They most let the other party go down.
So, you gain in speed by using an anchor an belay and you are more respect full if you belay your partner. In that trail, if there is ten people, it is normal to wait 30 minutes with or whit out rope. But when a climber took more than ten minute in a move...it is too slow. Slow climber most let the normal speed climber go first.