Also on days when it is 15 - 20 and I need a rest or some safe house keeping time, a jib allows me to loose my main free and the cat will sail close and steady without my hand on the tiller.
Can an una rig do that?
I'm not sure how you get a boat to sail close hauled on jib only: the pressure on the jib is going to turn the boat downwind without any pressure from the main... Unless I misunderstand what you mean?
To stop my unirigs I just release the main, push the tiller all the way and the boat will start to oscillate forward and back, drifting. Less stable than a sloop with the jib sheeted on the wrong side, but still works.
Plus, jibs bring a certain design beauty to a boat.
I have a spinnaker for that purpose. It's blue and white, a thing of beauty
