Dave; PTC is millennia behind others on fillet/round performance. The real time UI is a huge drag on CPU/GPU cycles. And the intuitive UI rating is near zero. I don't know how anyone can design plastics without some some real horsepower behind their workstation.
I know this is one area that SolidWorks just shines! Unfortunately, I think PTC is pretty much committed to this UI and algorithm. As with all thing marginal in Creo, we're going to have to live with it. Maybe Creo 3.0 (?)
Feel free to add a few ideas to the Ideas section. I am not sure there is a quick way to upgrade the UI but if you come up with some, I would be happy to vote up a good idea.
One thing I would -really- like is to have draggers be more intelligent by adding a "jump size" limit. By this I mean that between GPU refresh cycles, the dragger will only change maybe 10-20% max of the current value. A .01 value shouldn't suddenly allow a 5.0 value. If that is what you want, you can type that in.