I think that a "re rendering" confirmation is needed before VW starts going to town on a custom render works setting. I can't tell you how many times I will be working on something after trying a rendering setting, and thinking I am no longer in a render mode and then all of a sudden, VW re renders because I switched views slightly or hit a button that starts the thing over. Then, of course, things start to get disjointed, pixilated, and my button clicks all lag to the point where I can even stop the rendering because my keystrokes don't register in real time and I can't figure out the magical key stroke to stop the thing. (escape escape I think). How about a pop up or some sort of giant red "STOP RENDER" button that is in an obvious area. Also, and perhaps more importantly, how about a "PAUSE RENDER" button also so I can look at other stuff when I need to keep working on things, and then hit resume when I have the time to go back to it.